Sometimes we need to have checkboxes in the GridView control and we want that as soon as the Checkbox is clicked/checked the postback happens and we get the value from the first row in the GridView control.

This can be easily done by using the following code:

 AutoGenerateColumns="False" OnRowCommand="GridView1_RowCommand">
            
                                 HeaderText="CategoryID" />
                                 HeaderText="CategoryName" />
                
                    
                                                 AutoPostBack="true" runat="server"
                        OnCheckedChanged="CheckBox1_CheckedChanged1" />
                        
                    
                
            
        

And the code behind:

 protected void CheckBox1_CheckedChanged1(object sender, EventArgs e)
    {
        CheckBox checkbox = (CheckBox)sender;
        GridViewRow row = (GridViewRow) checkbox.NamingContainer;
        Response.Write(row.Cells[0].Text); 
    }

Ohh by the way when you click a different checkbox it will show you the new value but does not clear the old checkbox. You can make a simple method “ClearCheckboxSelection” which clears all the checkboxes.

Hope you find this example useful