Please help i am try to generate an editable GridView but getting error below
Unable to cast object of type 'System.EventArgs' to type 'System.Web.UI.WebControls.GridViewRowEventArgs'.
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="TeachersInitials.aspx.vb" Inherits="SMIS2022WEB.TeachersInitials" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Panel ID="Panel1" runat="server" Height="316px" Width="721px">
<table class="auto-style1">
<tr>
<td class="auto-style2"><strong>Class</strong></td>
<td class="auto-style3">
<asp:DropDownList ID="Classddl" runat="server" AutoPostBack="True" DataSourceID="clrd" DataTextField="CLASS" DataValueField="CLASS">
</asp:DropDownList>
<asp:SqlDataSource ID="clrd" runat="server" ConnectionString="<%$ ConnectionStrings:SMIS2022ConnectionString %>" SelectCommand="SELECT [CLASS] FROM [CLASS]"></asp:SqlDataSource>
</td>
<td class="auto-style2">
<asp:Button ID="Button1" runat="server" Text="Save Initials" />
</td>
</tr>
<tr>
<td colspan="3">
<asp:GridView ID="TrapedlistGrd" runat="server" AllowPaging="True" AutoGenerateColumns="False" PageSize="20" OnDataBound="OnRowDataBound">
<Columns>
<asp:TemplateField HeaderText="Subject">
<ItemTemplate>
<asp:DropDownList ID="Subject" runat="server" AutoPostBack="True" DataSourceID="Subjectr" DataTextField="subject" DataValueField="subject">
</asp:DropDownList>
<asp:SqlDataSource ID="Subjectr" runat="server" ConnectionString="<%$ ConnectionStrings:SMIS2022ConnectionString %>" SelectCommand="SELECT [subject] FROM [subjects]"></asp:SqlDataSource>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Initials">
<ItemTemplate>
<asp:TextBox ID="initials" runat="server" Text='<%# Eval("Initials") %>'></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Class">
<ItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
</asp:DropDownList>
<asp:Label ID="Lclasses" runat="server" Text='<%# Eval("class") %>' Visible="False"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Stream">
<ItemTemplate>
<asp:DropDownList ID="Streamddl" runat="server" AutoPostBack="True" DataSourceID="strdd" DataTextField="Stream" DataValueField="Stream">
</asp:DropDownList>
<asp:SqlDataSource ID="strdd" runat="server" ConnectionString="<%$ ConnectionStrings:SMIS2022ConnectionString %>" SelectCommand="SELECT [Stream] FROM [Streamdata]"></asp:SqlDataSource>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Type">
<ItemTemplate>
<asp:TextBox ID="Type" runat="server" Text='<%# Eval("type") %>'></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Full Names">
<ItemTemplate>
<asp:TextBox ID="Fullnames" runat="server" Text='<%# Eval("fulnames") %>'></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</td>
</tr>
</table>
</asp:Panel>
</div>
</form>
</body>
</html>
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Public Class TeachersInitials
Inherits System.Web.UI.Page
Dim constr As String = ConfigurationManager.ConnectionStrings("SMIS2022ConnectionString").ConnectionString
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Me.IsPostBack Then
BindGrid()
End If
End Sub
Private Sub BindGrid()
Dim constr As String = ConfigurationManager.ConnectionStrings("SMIS2022ConnectionString").ConnectionString
Using con As New SqlConnection(constr)
Using cmd As New SqlCommand("SELECT Subject, class, stream, Initials, Type, Fulnames FROM Trapedlist where class = '" & "P1" & "'", con)
Using sda As New SqlDataAdapter()
cmd.Connection = con
sda.SelectCommand = cmd
Using dt As New DataTable()
sda.Fill(dt)
TrapedlistGrd.DataSource = dt
TrapedlistGrd.DataBind()
End Using
End Using
End Using
End Using
End Sub
