Why error in cmd.Parameters.AddWithValue("@rtype",sc1); and also i want to use update panel here

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Html Part is
error in cmd.Parameters.AddWithValue("@rtype",sc1);

ASP.NET

<form id="form1"  runat="server">
    <div>
    
        <table align="center" class="style1">
            <tr>
                <td class="style8">
                    
                </td>
                <td class="style6">
                     </td>
                <td class="style11">
                     </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style9">
                </td>
                <td class="style4">
                    Your Email ID</td>
                <td class="style12">
                    <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
                </td>
                <td class="style15">
                     </td>
                <td class="style3">
                </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    First Name</td>
                <td class="style11">
                    <asp:TextBox ID="txtFname" runat="server"></asp:TextBox>
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    Last Name</td>
                <td class="style11">
                    <asp:TextBox ID="txtLname" runat="server"></asp:TextBox>
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style10">
                </td>
                <td class="style7">
                    Date of Birth</td>
                <td class="style13">
                    <asp:TextBox ID="txtDob" runat="server"></asp:TextBox>
                </td>
                <td class="style16">
                     </td>
                <td class="style5">
                </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    Contact Number</td>
                <td class="style11">
                    <asp:TextBox ID="txtCno" runat="server"></asp:TextBox>
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style2" colspan="2">
                    <asp:RadioButton ID="rbStudent" runat="server" Text="Student" 
                        GroupName="Type" AutoPostBack="True" 
                        oncheckedchanged="RadioButton1_CheckedChanged"  />
                    <br />
                    <asp:RadioButton ID="rbPFaculty" runat="server" Text="Private Faculty" 
                        oncheckedchanged="RadioButton2_CheckedChanged" GroupName="Type" 
                        AutoPostBack="True" />
                    <br />
                    <asp:RadioButton ID="rbSFaculty" runat="server" Text="SchoolFaculty" 
                        GroupName="Type" />
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    Class</td>
                <td class="style11">
                    <asp:DropDownList ID="ddClass" runat="server">
                    </asp:DropDownList>
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    School</td>
                <td class="style11">
                    <asp:TextBox ID="txtSchool" runat="server"></asp:TextBox>
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    Board</td>
                <td class="style11">
                    <asp:DropDownList ID="ddBoard" runat="server">
                    </asp:DropDownList>
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style10">
                </td>
                <td class="style7">
                    City</td>
                <td class="style13">
                    <asp:DropDownList ID="ddCity" runat="server">
                    </asp:DropDownList>
                </td>
                <td class="style16">
                    </td>
                <td class="style5">
                </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    Pin Code</td>
                <td class="style11">
                    <asp:TextBox ID="txtPCode" runat="server"></asp:TextBox>
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    State</td>
                <td class="style11">
                    <asp:DropDownList ID="ddState" runat="server">
                    </asp:DropDownList>
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6" colspan="2">
                    <asp:CheckBox ID="CheckBox1" runat="server" Text="Term & Condition" />
                </td>
                <td class="style14" valign="middle">
                    Read Condition</td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                    <asp:Button ID="Button1" runat="server" Text="Submit Details" 
                        onclick="Button1_Click" />
                </td>
                <td class="style11">
                    <asp:Button ID="Button2" runat="server" Text="Refill all Details" />
                </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
            <tr>
                <td class="style8">
                     </td>
                <td class="style6">
                     </td>
                <td class="style11">
                     </td>
                <td class="style14">
                     </td>
                <td>
                     </td>
            </tr>
        </table>
    
    </div>
    </form>

cs coding is

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

public partial class registration : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void RadioButton2_CheckedChanged(object sender, EventArgs e)
    {
        if (rbPFaculty.Checked == true)
        {
            ddClass.Enabled = true;
        }
    }
    protected void RadioButton1_CheckedChanged(object sender, EventArgs e)
    {
        if (rbStudent.Checked == true)
        {
            ddClass.Enabled = false;
        }
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string sc1;

        if (rbStudent.Checked == true)
        {
            sc1 = "Student";
        }
        if (rbPFaculty.Checked == true)
        {
            sc1 = "Private Faculty";
        }
        if (rbSFaculty.Checked == true)
        {
            sc1 = "School Faculty";
        }

        SqlConnection CON = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["tuitionConnectionString"].ConnectionString);
        SqlTransaction tr = null;
        CON.Open();
        tr = CON.BeginTransaction();
        try
        {
            SqlCommand cmd = new SqlCommand("insert into registration (email,fname,lname,dob,cont,rtype,tclass,board,city,pcode,state) values (@email,@fname,@lname,@dob,@cont,@rtype,@tclass,@board,@city,@pcode,@state)");
            cmd.Parameters.AddWithValue("@email", txtEmail.Text);
            cmd.Parameters.AddWithValue("@fname", txtFname.Text);
            cmd.Parameters.AddWithValue("@lname", txtLname.Text);
            cmd.Parameters.AddWithValue("@dob", txtDob.Text);
            cmd.Parameters.AddWithValue("@cont", txtCno.Text);
            cmd.Parameters.AddWithValue("@rtype",sc1);
            cmd.Parameters.AddWithValue("@tclass", ddClass.SelectedValue);
            cmd.Parameters.AddWithValue("@board", txtFname.Text);
            cmd.Parameters.AddWithValue("@city", txtFname.Text);
            cmd.Parameters.AddWithValue("@pcode", txtFname.Text);
            cmd.Parameters.AddWithValue("@state", txtFname.Text);
            cmd.Connection = CON;
            cmd.ExecuteNonQuery();
            tr.Commit();

        }
        catch (Exception ex)
        {
            tr.Rollback();
        }
        finally
        {
            CON.Close();
        }
    }
}

Posted 16-Dec-11 22:38pm

Janardan Pandey

Updated 16-Dec-11 22:43pm

thatraja

v2

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Comments

thatraja 17-Dec-11 4:39am

What's the error message?

Janardan Pandey 17-Dec-11 5:00am

error is in cs part in the line

cmd.Parameters.AddWithValue("@rtype",sc1);

how to use sc1 in this line?

1 solution

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RemcoReitsma · Answer 1 · 2011-12-16T22:58:00

Solution 1

You have not initialized sc1.
So if rbStudent and rbPFaculty and rbSFaculty are not checked then sc1 = null

I suspect you get the error when executing the query and that rtype is a not nullable field.

Posted 16-Dec-11 22:58pm

RemcoReitsma