I am unable to display value in gridview.

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Actually i am working with online attendance management system ,
but i am facing a little problem.

I fetch all record from database and display in gridview but the problem is when i am trying to display count value with each row of gridview.

What I have tried:

<pre>void gvattendcount()
    {

        SqlConnection cnn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
        foreach (GridViewRow row in GVattend.Rows)
        {
            string rollno = (((Label)row.FindControl("lblroll")).Text);
            string attendlecture = (((Label)row.FindControl("lblattend")).Text);

            string query = "SELECT COUNT(*) as attendlecture FROM class8_attend where  rollno ='" + rollno + "' AND present ='p'";

            DataTable dtAdmin = new DataTable();
            SqlDataAdapter da;
            da = new SqlDataAdapter(query, cnn);
            da.Fill(dtAdmin);

            if (dtAdmin.Rows.Count > 0)
            {
                using (SqlCommand cmd = new SqlCommand(query, cnn))
                {
                    cnn.Open();
                    Int32 count = (Int32)cmd.ExecuteScalar();
                    attendlecture = count.ToString();
                    cnn.Close();
                }

                
            }
        }
    }

CSS-

<asp:TemplateField  HeaderText="ATTENDED LECTURES" >
           <ItemTemplate>
           <center>
            <asp:Label ID="lblattend" runat="server" Text=""></asp:Label>
           </center>
           </ItemTemplate>
           </asp:TemplateField>

Posted 14-Mar-17 20:58pm

ADI@345

Updated 14-Mar-17 23:17pm

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Comments

Graeme_Grant 15-Mar-17 3:07am

You posted the same question here less than an hour ago: https://www.codeproject.com/Questions/1176552/How-to-count-each-record-from-database-and-display

Please do not ask the same question repeatedly.

ADI@345 15-Mar-17 3:12am

Actually, I solved that problem. This is another problem that I am facing right now.

2 solutions

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Sunasara Imdadhusen · Answer 1 · 2017-03-14T21:30:00

Solution 1

You have missed assign value of the column using Bind.

<asp:TemplateFiel>
<ItemTemplate>
        <asp:Label ID="lblattend" runat="server" Text='<%# Bind("attendlecture") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateFiel>

Posted 14-Mar-17 21:30pm

Sunasara Imdadhusen

v2

F-ES Sitecore · Answer 2 · 2017-03-14T23:17:00

string attendlecture = (((Label)row.FindControl("lblattend")).Text);

// ....

attendlecture = count.ToString();

You need to appreciate the difference between "value" types and "reference" types. When you load the value of lblAttend into attendlecture that is all you are doing, that variable is not a reference to the lblattent.Text property, it is simply a copy of it, so when you update it you're only overwriting the copy. You need to do this instead

Label lblattend = (Label)row.FindControl("lblattend");

// ....

lblattend.Text = count.ToString();