[Solved] ASP.Net Error: does not contain a definition for GridView1_RowCommand

Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1061: 'ASP.customerregister_aspx' does not contain a definition for 'GridView1_RowCommand' and no extension method 'GridView1_RowCommand' accepting a first argument of type 'ASP.customerregister_aspx' could be found (are you missing a using directive or an assembly reference?) Source Error:

Line 322:    <td >
Line 323:    <asp:Label ID="Nodata" runat ="server" Visible="false" Text="please add the data" ForeColor ="Red" Font-Bold ="true" Font-Size ="X-Large"></asp:Label>
Line 324:    <asp:GridView ID="GridView1" Class="myGridClass" runat="server" AutoGenerateColumns="false" HorizontalAlign="Right" PageSize="10"  AllowPaging="true" OnPageIndexChanging="OnPaging" OnRowCommand="GridView1_RowCommand" OnRowDeleting="GridView1_RowDeleting" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" DataKeyNames="ID">
Line 325:        <RowStyle CssClass="gridCSS" />
Line 326:        <AlternatingRowStyle CssClass="gridAlternateCSS" />

 frontend code

<asp:GridView ID="GridView1" Class="myGridClass" runat="server" AutoGenerateColumns="false" HorizontalAlign="Right" PageSize="10" AllowPaging="true" OnPageIndexChanging="OnPaging" OnRowCommand="GridView1_RowCommand" OnRowDeleting="GridView1_RowDeleting" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" DataKeyNames="ID">
    <RowStyle CssClass="gridCSS" />
    <AlternatingRowStyle CssClass="gridAlternateCSS" />
    <HeaderStyle CssClass="gridCSS" />
    <Columns>
        <asp:BoundField DataField="ID" HeaderText="ID" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true" />
        <asp:BoundField DataField="CustomerName" HeaderText="Customer Name" HeaderStyle-Width ="100px" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true" />
        <asp:BoundField DataField="Date" HeaderText="Date" DataFormatString ="{0:dd/MM/yyyy}" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true" />
        <asp:BoundField DataField="withdepositconnection" HeaderText="With Dep Conn" HeaderStyle-Width ="50px" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true" />
        <asp:BoundField DataField="zerodepositconnection" HeaderText="Zero Dep Conn" HeaderStyle-Width ="50px" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true" />
        <asp:BoundField DataField="OpenCylinderbalance" HeaderText="Opn Cyl Bal" HeaderStyle-Width ="50px" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true" />
        <asp:BoundField DataField="AmountDebit" HeaderText="Debit Amt" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true" />
        <asp:BoundField DataField="AmountCredit" HeaderText="Credit Amt" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true"/>
        <asp:TemplateField HeaderText="Edit Details" ControlStyle-Font-Bold="true" ControlStyle-ForeColor="Black" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true">
            <ItemTemplate>
                <asp:LinkButton ID="lnkview" runat="server" CssClass="gridCSS" ForeColor="green" Font-Bold="true" CommandArgument='<%# Eval("ID") %>' OnClick="lnk_OnClick">Edit</asp:LinkButton>
                <%-- <asp:ImageButton ID="ImageButton1" ImageUrl="~/images/edit-icon.png" runat="server" Width="15" Height="15" CommandArgument='<%# Eval("ID") %>' OnClick="lnk_OnClick" CausesValidation="false"/>--%>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Delete" ShowHeader="False" HeaderStyle-Font-Names="center" HeaderStyle-Font-Size="Small" HeaderStyle-Font-Bold="true">
            <ItemTemplate>
                <asp:LinkButton ID="lnkDelete" runat="server" CausesValidation="False"
                    CommandName="Delete" OnClientClick="javascript: return confirm('Do you want to delete Customer this record?')" CommandArgument='<%# Eval("ID") %>' Text="Delete"></asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

 backend code

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
    int ID = Convert.ToInt32(e.CommandArgument.ToString());
}

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    GridView1.DataBind();
}

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{

}