GridView Edit

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C#3.0

C#

Hi i'm developing the asp.net project.here when i'm click the textbox in
gridview edit,display the error message.
The error message as

"Invalid postback or callback argument. Event validation is enabled using <%pages enableEventValidation="true"%> in configuration or <%@ Page EnableEventValidation="true"%> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation"

here the code as

<asp:GridView ID="sview" runat="server" SelectedIndex="0" OnRowDataBound ="Table_DataBound"
                style="font-family: Verdana; font-size: X-Small; font-weight: bold; top: 13px; left: 1px; position: absolute; height: 20px; width: 646px; border: 1px Solid Black"
                 OnRowEditing ="Table_Edit" OnRowUpdating ="Table_Update" OnRowCancelingEdit ="Table_Cancel">
                <columns>
                <asp:TemplateField  HeaderText="subname" HeaderStyle-HorizontalAlign ="Left" >
                    <edititemtemplate> 
                        <asp:TextBox ID="txtsubname" runat="server" Text='<%# Bind("subname") %>'> 
                    </edititemtemplate> 
                    <footertemplate> 
                        <asp:TextBox ID="txtNewName" runat="server" > 
                    </footertemplate> 
                    <itemtemplate> 
                        <%# Eval("subname") %>
                    </itemtemplate> 
                
                 <asp:TemplateField HeaderText="sname" HeaderStyle-HorizontalAlign="Left"> 
                    <edititemtemplate> 
                        <asp:DropDownList ID="cmbgname" runat="server" DataTextField="Typename" DataValueField="Id">  
                    </edititemtemplate> 
                    <itemtemplate> 
                        <%# Eval("gname") %>
                    </itemtemplate> 
                    <footertemplate> 
                        <asp:DropDownList ID="cmbgname" runat="server" DataTextField="Typename" DataValueField="Id">  
                    </footertemplate> 
             
                    <asp:CommandField SelectText="" ShowSelectButton="True" />
                    <asp:CommandField CancelText="" EditText="" ShowEditButton="True" 
                        UpdateText="" />
                </columns>
                <SelectedRowStyle BackColor="#5691FE" />
                <HeaderStyle BackColor="#D6BBBA" HorizontalAlign="Left" />

protected void Table_Edit(object sender, object e)
{
    GridViewEditEventArgs ex = new GridViewEditEventArgs(sview.SelectedIndex);
    sview.EditIndex = ex.NewEditIndex;
    BindData();
}
protected void Table_Update(object sender, object e)
{
    DataTable dt = (DataTable)Session["ATable"];
    GridViewRow row = sview.Rows[sview.EditIndex];
    if (row.Cells[6].Text.Equals("Y"))
    {
        dt.Rows[row.DataItemIndex]["subname"] = ((TextBox)(row.Cells[2].FindControl (""))).Text;
        dt.Rows[row.DataItemIndex]["gname"] = ((DropDownList)(row.Cells[4].FindControl(""))).SelectedValue;
    }
    sview.EditIndex = -1;
    DataBind();
}
protected void Table_Cancel(object sender, object e)
{
    sview.EditIndex = -1;
    DataBind();
}

[edit]Code blocks added to preserve formatting - OriginalGriff[/edit]