'ASP.default_aspx' does not contain a definition for 'GridView1_RowDataBound1' and no extension method 'GridView1_RowDataBound1' accepting a first argument of type 'ASP.default_aspx' could be found (are you missing a using directive or an assembly reference?)

<asp:GridView ID="GridView1" runat="server"
                OnRowDataBound="GridView1_RowDataBound1" 
                AllowSorting="True" AutoGenerateColumns="False" 
                BackColor="White" BorderColor="#E7E7FF" BorderStyle="None" 
                BorderWidth="1px" CellPadding="3" DataKeyNames="id" 
                DataSourceID="AccessDataSource1" 
                GridLines="Horizontal" 
                >

        protected void GridView1_RowDataBound1(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                e.Row.CssClass = e.Row.RowState.ToString();
                e.Row.Attributes["onclick"] = "window.location='Default.aspx?type=edit&id=" + e.Row.Cells[1].Text + "'";
            }

        }