Question

I am using a gridview. When I click on the edit button the update and cancel button appear.
Upon modifying the values in textbox which come from EditItemTemplate , the new values dont show in the event handler rowupdating(), instead I get the values which appear when the page was rendered. How do I grab the new values from these textboxes and proceed further?
Here is the code.

<asp:GridView ID="GridView1" runat="server" AutoGenerateEditButton="true" AutoGenerateColumns="false" 
        AutoGenerateDeleteButton="true" onrowediting="GridView1_RowEditing" 
        onrowupdating="GridView1_RowUpdating">
    <Columns>


    <asp:TemplateField>
    <ItemTemplate>
        <asp:Label ID="lblId" runat="server" Text='<%# Eval("id") %>'></asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="txtId" runat="server" Text='<%# Eval("id") %>'></asp:TextBox>
    </EditItemTemplate>
    </asp:TemplateField>

    <asp:TemplateField>
    <ItemTemplate>
        <asp:Label ID="lblName" runat="server" Text='<%# Eval("cpuname") %>'></asp:Label>
    </ItemTemplate>
    <EditItemTemplate>
        <asp:TextBox ID="txtName" 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="txtStatus" runat="server" Text='<%# Eval("status") %>'></asp:TextBox>
     </EditItemTemplate>
    </asp:TemplateField>

    </Columns>


</asp:GridView>


protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
        {
            GridView1.EditIndex = e.NewEditIndex;
        }

        protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            TextBox text = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtName");
        }

Answer 1

You should use the two way binding here. I.e. Bind instead of Eval:

<asp:TextBox ID="txtId" runat="server" Text='<%# Bind("id") %>'></asp:TextBox>

Here is the link to documentation:

Data-Binding Expressions Overview

Here is my code behind:

protected void Page_Load(object sender, EventArgs e)
    {
        DataTable table = new DataTable();
        table.Columns.Add("Data");
        for(int i = 0; i < 20; i++)
            table.Rows.Add(new object[] { i });
        GridView1.DataSource = table;
    if(!IsPostBack)  // <<<<<<<<<<<<
        GridView1.DataBind();
    }
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        GridView1.EditIndex = e.NewEditIndex;
        GridView1.DataBind();
    }       

    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        TextBox text = (TextBox)GridView1.Rows[e.RowIndex].FindControl("txtId");
    }