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autopostback problem in gridview why it show multiples times...

Posted By:      Posted Date: September 19, 2010    Points: 0   Category :ASP.Net

    <form id="form1" runat="server">
        <asp:DropDownList ID="DropDownList9" runat="server" DataSourceID="SC" DataTextField="ItemNo"
            DataValueField="ItemNo" Style=" left: 131px; position: absolute;
            top: 41px; z-index: 104;" OnSelectedIndexChanged="DropDownList9_SelectedIndexChanged" TabIndex="12" AutoPostBack="True" OnDataBound="DropDownList9_DataBound">
        <asp:GridView style="Z-INDEX: 101; LEFT: 14px; POSITION: absolute; TOP: 183px; width: 953px;" 
        id="Gridview1" runat="server" Height="127px" ForeColor="Teal" Font-Size="12pt" 
        Font-Names="Palatino Linotype" Font-Bold="True" Visible="False" 
        BorderColor="Transparent" OnRowDataBound="Gridview1_RowDataBound" 
        ShowFooter="True" SelectedIndex="5" OnRowCreated="Gridview1_RowCreated" 
        GridLines="None" CellSpacing="2" AutoGenerateColumns="False"><Columns>
<asp:BoundField DataField="RowNumber

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