Problem in displaying result from two successive drop down list

Question

2.33/5 (3 votes)

See more:

Design:

SQL

<asp:Button ID="btnselect" runat="server" Height="30px"
            onclick="btnselect_Click" Text="Select" Width="69px" />

XML

<asp:DropDownList ID="BranchList" runat="server" Height="60px" Width="140px"
            onselectedindexchanged="BranchList_SelectedIndexChanged">
        </asp:DropDownList>

XML

<asp:DropDownList ID="StudentList" runat="server" Height="60px" Width="140px"
          onselectedindexchanged="StudentList_SelectedIndexChanged">
      </asp:DropDownList>

XML

<table style="width: 100%">
        <tr>
            <td>
                &nbsp;</td>
            <td>
                &nbsp;</td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblname" runat="server" Text="Name"></asp:Label>
            </td>
            <td>
                <asp:TextBox ID="txtname" runat="server" Height="20px" Width="150px"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblroll_no" runat="server" Text="Roll No"></asp:Label>
            </td>
            <td>
                <asp:TextBox ID="txtroll_No" runat="server" Height="20px" Width="150px"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblbranch" runat="server" Text="Branch"></asp:Label>
            </td>
            <td>
        <asp:DropDownList ID="BranchList0" runat="server" Height="60px" Width="140px"
            onselectedindexchanged="BranchList_SelectedIndexChanged">
        </asp:DropDownList>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblrecruiter" runat="server" Text="Recruiter"></asp:Label>
            </td>
            <td>
                <asp:TextBox ID="txtrecruiter" runat="server"
                   Height="20px" Width="150px"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblpackage" runat="server" Text="Package"></asp:Label>
            </td>
            <td>
                <asp:TextBox ID="txtpackage" runat="server" Height="20px" Width="150px"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td>
                &nbsp;</td>
            <td>
                &nbsp;</td>
        </tr>
        <tr>
            <td>
                &nbsp;</td>
            <td>
                <asp:Button ID="btnsubmit" runat="server" onclick="btnsubmit_Click"
                    Text="Submit" />
            </td>
        </tr>
    </table>

Coding:

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            loadBranchList();
            loadStudentList();
            loadBranchList0();
        }

    }

    protected void loadBranchList()
    {
        SqlConnection CON;
        SqlCommand COM;
        SqlDataReader READER;

        string ConnectionString = ConfigurationManager.ConnectionStrings["TnP"].ConnectionString;
        CON = new SqlConnection(ConnectionString);
        COM = new SqlCommand("Select Branches from Branches", CON);

        try
        {
            CON.Open();
            READER = COM.ExecuteReader();
            BranchList.DataSource = READER;
            BranchList.DataValueField = "Branches";
            BranchList.DataBind();
            READER.Close();
        }

        catch
        {
            CON.Close();
        }
      
    }

    protected void loadBranchList0()
    {
        SqlConnection CON;
        SqlCommand COM;
        SqlDataReader READER;

        string ConnectionString = ConfigurationManager.ConnectionStrings["TnP"].ConnectionString;
        CON = new SqlConnection(ConnectionString);
        COM = new SqlCommand("Select Branches from Branches", CON);

        try
        {
            CON.Open();
            READER = COM.ExecuteReader();
            BranchList0.DataSource = READER;
            BranchList0.DataValueField = "Branches";
            BranchList0.DataBind();
            READER.Close();
        }

        catch
        {
            CON.Close();
        }

    }



    protected void loadStudentList()
    {
        if (!IsPostBack)
        {

            SqlConnection CON;
            SqlCommand COM;
            SqlDataReader READER;

            string ConnectionString = ConfigurationManager.ConnectionStrings["TnP"].ConnectionString;
            CON = new SqlConnection(ConnectionString);

            if (BranchList.Text == "ECE")
            {
                COM = new SqlCommand("Select Name,Roll_No from [ECE(07-11)]", CON);

            }

            else if (BranchList.Text == "CSE")
            {
                COM = new SqlCommand("Select Name,Roll_No from [CSE(07-11)]", CON);


            }
            else if (BranchList.Text == "IT")
            {
                COM = new SqlCommand("Select Name,Roll_No from [IT(07-11)]", CON);


            }
            else if (BranchList.Text == "CE")
            {
                COM = new SqlCommand("Select Name,Roll_No from [CE(07-11)]", CON);

            }
            else if (BranchList.Text == "EE")
            {
                COM = new SqlCommand("Select Name,Roll_No from [EE(07-11)]", CON);



            }
            else if (BranchList.Text == "ME")
            {
                COM = new SqlCommand("Select Name,Roll_No from [ME(07-11)]", CON);




            }
            //else if (BranchList.Text == "PE")

            {
                COM = new SqlCommand("Select Name,Roll_No from [PE(07-11)]", CON);

            }


            //else
            //{
            //    COM = new SqlCommand("Select Name,Roll_No from [MBA(07-11)]", CON);
            //}

            CON.Open();
            READER = COM.ExecuteReader();
            StudentList.DataSource = READER;
            StudentList.DataValueField = "Roll_No";
            StudentList.DataTextField = "Name";
            StudentList.DataBind();

            READER.Close();

            CON.Close();

        }
    }


    protected void btnsubmit_Click(object sender, EventArgs e)
    {
        {
            SqlConnection CON;
            SqlCommand COM;
            CON = new SqlConnection(ConfigurationManager.ConnectionStrings["TnP"].ConnectionString);
            if (BranchList0.Text == "ECE")
            {
                COM = new SqlCommand("INSERT INTO [ECE(07-11)] (Name,Roll_No,Branch,Recruiter,Package) VALUES (@Name,@Roll_No,@Branch,@Recruiter,@Package)", CON);

                COM.Parameters.Add("@Name", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Name"].Value = txtname.Text;

                COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
                COM.Parameters["@Roll_No"].Value = Convert.ToInt32(txtroll_No.Text);

                COM.Parameters.Add("@Branch", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Branch"].Value = BranchList0.Text;

                COM.Parameters.Add("@Recruiter", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Recruiter"].Value = txtrecruiter.Text;

                COM.Parameters.Add("@Package", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Package"].Value = txtpackage.Text;
            }

            else if (BranchList0.Text == "CSE")
            {
                COM = new SqlCommand("INSERT INTO [CSE(07-11)] (Name,Roll_No,Branch,Recruiter,Package) VALUES (@Name,@Roll_No,@Branch,@Recruiter,@Package)", CON);

                COM.Parameters.Add("@Name", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Name"].Value = txtname.Text;

                COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
                COM.Parameters["@Roll_No"].Value = Convert.ToInt32(txtroll_No.Text);

                COM.Parameters.Add("@Branch", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Branch"].Value = BranchList0.Text;

                COM.Parameters.Add("@Recruiter", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Recruiter"].Value = txtrecruiter.Text;

                COM.Parameters.Add("@Package", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Package"].Value = txtpackage.Text;
            }

            else if (BranchList0.Text == "IT")
            {
                COM = new SqlCommand("INSERT INTO [IT(07-11)] (Name,Roll_No,Branch,Recruiter,Package) VALUES (@Name,@Roll_No,@Branch,@Recruiter,@Package)", CON);

                COM.Parameters.Add("@Name", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Name"].Value = txtname.Text;

                COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
                COM.Parameters["@Roll_No"].Value = Convert.ToInt32(txtroll_No.Text);

                COM.Parameters.Add("@Branch", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Branch"].Value = BranchList0.Text;

                COM.Parameters.Add("@Recruiter", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Recruiter"].Value = txtrecruiter.Text;

                COM.Parameters.Add("@Package", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Package"].Value = txtpackage.Text;
            }

            else if (BranchList0.Text == "CE")
            {
                COM = new SqlCommand("INSERT INTO [CE(07-11)] (Name,Roll_No,Branch,Recruiter,Package) VALUES (@Name,@Roll_No,@Branch,@Recruiter,@Package)", CON);

                COM.Parameters.Add("@Name", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Name"].Value = txtname.Text;

                COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
                COM.Parameters["@Roll_No"].Value = Convert.ToInt32(txtroll_No.Text);

                COM.Parameters.Add("@Branch", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Branch"].Value = BranchList0.Text;

                COM.Parameters.Add("@Recruiter", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Recruiter"].Value = txtrecruiter.Text;

                COM.Parameters.Add("@Package", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Package"].Value = txtpackage.Text;
            }

            else if (BranchList0.Text == "EE")
            {
                COM = new SqlCommand("INSERT INTO [EE(07-11)] (Name,Roll_No,Branch,Recruiter,Package) VALUES (@Name,@Roll_No,@Branch,@Recruiter,@Package)", CON);

                COM.Parameters.Add("@Name", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Name"].Value = txtname.Text;

                COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
                COM.Parameters["@Roll_No"].Value = Convert.ToInt32(txtroll_No.Text);

                COM.Parameters.Add("@Branch", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Branch"].Value = BranchList0.Text;

                COM.Parameters.Add("@Recruiter", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Recruiter"].Value = txtrecruiter.Text;

                COM.Parameters.Add("@Package", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Package"].Value = txtpackage.Text;
            }
            else if (BranchList0.Text == "ME")
            {
                COM = new SqlCommand("INSERT INTO [ME(07-11)] (Name,Roll_No,Branch,Recruiter,Package) VALUES (@Name,@Roll_No,@Branch,@Recruiter,@Package)", CON);

                COM.Parameters.Add("@Name", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Name"].Value = txtname.Text;

                COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
                COM.Parameters["@Roll_No"].Value = Convert.ToInt32(txtroll_No.Text);

                COM.Parameters.Add("@Branch", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Branch"].Value = BranchList0.Text;

                COM.Parameters.Add("@Recruiter", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Recruiter"].Value = txtrecruiter.Text;

                COM.Parameters.Add("@Package", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Package"].Value = txtpackage.Text;
            }
            else if (BranchList0.Text == "PE")
            {
                COM = new SqlCommand("INSERT INTO [PE(07-11)] (Name,Roll_No,Branch,Recruiter,Package) VALUES (@Name,@Roll_No,@Branch,@Recruiter,@Package)", CON);

                COM.Parameters.Add("@Name", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Name"].Value = txtname.Text;

                COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
                COM.Parameters["@Roll_No"].Value = Convert.ToInt32(txtroll_No.Text);

                COM.Parameters.Add("@Branch", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Branch"].Value = BranchList0.Text;

                COM.Parameters.Add("@Recruiter", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Recruiter"].Value = txtrecruiter.Text;

                COM.Parameters.Add("@Package", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Package"].Value = txtpackage.Text;
            }

            else
            {
                COM = new SqlCommand("INSERT INTO [MBA(07-11)] (Name,Roll_No,Branch,Recruiter,Package) VALUES (@Name,@Roll_No,@Branch,@Recruiter,@Package)", CON);

                COM.Parameters.Add("@Name", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Name"].Value = txtname.Text;

                COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
                COM.Parameters["@Roll_No"].Value = Convert.ToInt32(txtroll_No.Text);

                COM.Parameters.Add("@Branch", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Branch"].Value = BranchList0.Text;

                COM.Parameters.Add("@Recruiter", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Recruiter"].Value = txtrecruiter.Text;

                COM.Parameters.Add("@Package", System.Data.SqlDbType.NChar, 50);
                COM.Parameters["@Package"].Value = txtpackage.Text;
            }
            CON.Open();
            COM.ExecuteNonQuery();
            CON.Close();

        }
    }



    
    protected void btnselect_Click(object sender, EventArgs e)
    {
        SqlConnection CON;
        SqlCommand COM;
        SqlDataReader READER;
        string ConnectionString = ConfigurationManager.ConnectionStrings["TnP"].ConnectionString;
        CON = new SqlConnection(ConnectionString);

        if (BranchList.Text == "ECE" && (!IsPostBack) )
        {

            COM = new SqlCommand("SELECT Name,Roll_No,Branch,Recruiter,Package FROM [ECE(07-11)] " + "WHERE Roll_No= @Roll_No", CON);

            COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
            COM.Parameters["@Roll_No"].Value = StudentList.SelectedItem.Value;

            CON.Open();
            READER = COM.ExecuteReader();
            if (READER.Read())
            {
                txtname.Text = READER["Name"].ToString();
                txtroll_No.Text = READER["Roll_No"].ToString();
                BranchList0.Text = READER["Branch"].ToString();
                txtrecruiter.Text = READER["Recruiter"].ToString();
                txtpackage.Text = READER["Package"].ToString();
            }

            READER.Close();
        }

        else if (BranchList.Text == "CSE" && (!IsPostBack))
        {
            COM = new SqlCommand("SELECT Name,Roll_No,Branch,Recruiter,Package FROM [CSE(07-11)] " + "WHERE Roll_No= @Roll_No", CON);

            COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
            COM.Parameters["@Roll_No"].Value = StudentList.SelectedItem.Value;

            CON.Open();
            READER = COM.ExecuteReader();
            if (READER.Read())
            {
                txtname.Text = READER["Name"].ToString();
                txtroll_No.Text = READER["Roll_No"].ToString();
                BranchList0.Text = READER["Branch"].ToString();
                txtrecruiter.Text = READER["Recruiter"].ToString();
                txtpackage.Text = READER["Package"].ToString();
            }

            READER.Close();

        }

        else if (BranchList.Text == "IT" && (!IsPostBack))
        {
            COM = new SqlCommand("SELECT Name,Roll_No,Branch,Recruiter,Package FROM [IT(07-11)] " + "WHERE Roll_No= @Roll_No", CON);

            COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
            COM.Parameters["@Roll_No"].Value = StudentList.SelectedItem.Value;

            CON.Open();
            READER = COM.ExecuteReader();
            if (READER.Read())
            {
                txtname.Text = READER["Name"].ToString();
                txtroll_No.Text = READER["Roll_No"].ToString();
                BranchList0.Text = READER["Branch"].ToString();
                txtrecruiter.Text = READER["Recruiter"].ToString();
                txtpackage.Text = READER["Package"].ToString();
            }

            READER.Close();

        }

        else if (BranchList.Text == "CE" && (!IsPostBack))
        {
            COM = new SqlCommand("SELECT Name,Roll_No,Branch,Recruiter,Package FROM [CE(07-11)] " + "WHERE Roll_No= @Roll_No", CON);

            COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
            COM.Parameters["@Roll_No"].Value = StudentList.SelectedItem.Value;

            CON.Open();
            READER = COM.ExecuteReader();
            if (READER.Read())
            {
                txtname.Text = READER["Name"].ToString();
                txtroll_No.Text = READER["Roll_No"].ToString();
                BranchList0.Text = READER["Branch"].ToString();
                txtrecruiter.Text = READER["Recruiter"].ToString();
                txtpackage.Text = READER["Package"].ToString();
            }

            READER.Close();

        }

        else if (BranchList.Text == "EE" && (!IsPostBack))
        {
            COM = new SqlCommand("SELECT Name,Roll_No,Branch,Recruiter,Package FROM [EE(07-11)] " + "WHERE Roll_No= @Roll_No", CON);

            COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
            COM.Parameters["@Roll_No"].Value = StudentList.SelectedItem.Value;

            CON.Open();
            READER = COM.ExecuteReader();
            if (READER.Read())
            {
                txtname.Text = READER["Name"].ToString();
                txtroll_No.Text = READER["Roll_No"].ToString();
                BranchList0.Text = READER["Branch"].ToString();
                txtrecruiter.Text = READER["Recruiter"].ToString();
                txtpackage.Text = READER["Package"].ToString();
            }

            READER.Close();

        }

        else if (BranchList.Text == "ME" && (!IsPostBack))
        {
            COM = new SqlCommand("SELECT Name,Roll_No,Branch,Recruiter,Package FROM [ME(07-11)] " + "WHERE Roll_No= @Roll_No", CON);

            COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
            COM.Parameters["@Roll_No"].Value = StudentList.SelectedItem.Value;

            CON.Open();
            READER = COM.ExecuteReader();
            if (READER.Read())
            {
                txtname.Text = READER["Name"].ToString();
                txtroll_No.Text = READER["Roll_No"].ToString();
                BranchList0.Text = READER["Branch"].ToString();
                txtrecruiter.Text = READER["Recruiter"].ToString();
                txtpackage.Text = READER["Package"].ToString();
            }

            READER.Close();

        }

        else if (BranchList.Text == "PE" && (!IsPostBack))
        {
            COM = new SqlCommand("SELECT Name,Roll_No,Branch,Recruiter,Package FROM [PE(07-11)] " + "WHERE Roll_No= @Roll_No", CON);

            COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
            COM.Parameters["@Roll_No"].Value = StudentList.SelectedItem.Value;

            CON.Open();
            READER = COM.ExecuteReader();
            if (READER.Read())
            {
                txtname.Text = READER["Name"].ToString();
                txtroll_No.Text = READER["Roll_No"].ToString();
                BranchList0.Text = READER["Branch"].ToString();
                txtrecruiter.Text = READER["Recruiter"].ToString();
                txtpackage.Text = READER["Package"].ToString();
            }

            READER.Close();

        }

        else      
        {
            COM = new SqlCommand("SELECT Name,Roll_No,Branch,Recruiter,Package FROM [MBA(07-11)] " + "WHERE Roll_No= @Roll_No", CON);

            COM.Parameters.Add("@Roll_No", System.Data.SqlDbType.Int);
            COM.Parameters["@Roll_No"].Value = StudentList.SelectedItem.Value;

            CON.Open();
            READER = COM.ExecuteReader();
            if (READER.Read())
            {
                txtname.Text = READER["Name"].ToString();
                txtroll_No.Text = READER["Roll_No"].ToString();
                BranchList0.Text = READER["Branch"].ToString();
                txtrecruiter.Text = READER["Recruiter"].ToString();
                txtpackage.Text = READER["Package"].ToString();
            }

            READER.Close();
        
        }


    }

Posted 27-Jun-11 20:24pm

lovejeet0707

Updated 27-Jun-11 20:34pm

Prerak Patel

v2

Add a Solution

Comments

Dave Kreskowiak 28-Jun-11 10:53am

First, only post the relevent code snippets, not the whole damn project. Second, you might want to describe what the problem is you're having instead of use GUESSING AT IT by perusing your code for 20 minutes.

1 solution

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Prerak Patel · Answer 1 · 2011-06-27T20:40:00

Solution 1

I didn't find any code for BranchList_SelectedIndexChanged in your code behind.
Moreover, you can consider Ajax CascadingDropDown[^]. Use google[^] for samples if interested.

From next time, post only relevant code in your question.

Posted 27-Jun-11 20:40pm

Prerak Patel