Question

<asp:GridView ID="GridView1" runat="server"  
        style="height: 121px; width: 175px" BackColor="White" 
        BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px" CellPadding="4" 
        onrowediting="GridView1_RowEditing" AutoGenerateColumns="false">
        <Columns>
        <asp:CommandField ButtonType="Button" SelectText="Edit" ShowEditButton="true" />
        <asp:TemplateField>
        <ItemTemplate>
        <asp:Label ID="lblId" runat="server" Text='<%# Eval("Id") %>'></asp:Label>
        </ItemTemplate>
        <EditItemTemplate>
            <asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("Id") %>'></asp:TextBox>
        </EditItemTemplate>

        </asp:TemplateField>

        <asp:TemplateField>
        <ItemTemplate>
        <asp:Label ID="lblCpuName" runat="server" Text='<%# Eval("cpuname") %>'></asp:Label>
        </ItemTemplate>
        <EditItemTemplate>
            <asp:TextBox ID="TextBox2" runat="server" Text='<%# Eval("cpuname") %>'></asp:TextBox>
        </EditItemTemplate>
        </asp:TemplateField>



        <asp:TemplateField>
        <ItemTemplate>
        <asp:Label ID="lblStatus" runat="server" Text='<%# Eval("status") %>'></asp:Label>
        </ItemTemplate>
        <EditItemTemplate>
            <asp:TextBox ID="TextBox3" runat="server" Text='<%# Eval("status") %>'>></asp:TextBox>
        </EditItemTemplate>
        </asp:TemplateField>

        </Columns>

    </asp:GridView>


protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
        {
            SqlDataSource1.UpdateCommandType = SqlDataSourceCommandType.Text;
            GridViewRow row = GridView1.Rows[e.NewEditIndex];
            TextBox txt = (TextBox)row.FindControl("TextBox2");
            SqlDataSource1.UpdateParameters["CpuName"].DefaultValue = txt.Text;
            SqlDataSource1.UpdateParameters["cpuid"].DefaultValue = "3";
            SqlDataSource1.Update();
            BindGridView();

        }

I am getting a object reference not set to an object on the textbox txt. I am not able to get the textbox2 in my gridview.

Answer 1

Can you try this

GridViewRow row = GridView1.Rows[GridView1.NewEditIndex];
TextBox txt = row.Cells[1].Controls[1] as TextBox;  
If (txt!= null)
{
    SqlDataSource1.UpdateParameters["CpuName"].DefaultValue = txt.Text;
    SqlDataSource1.UpdateParameters["cpuid"].DefaultValue = "3";
    SqlDataSource1.Update();
    BindGridView();
}