Data Controls :: Adding New Row To GridView TextBox Value Getting Cleared

Apr 4, 2014

i have grid as 

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField>
<ItemTemplate>

[Code].....

when i click on add button to add second row the values from first row get vanished. So how i can maintain the viewstate for those controls

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[CODE]...

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