验证textbox
function chktext(source, args){
if(args.Value=="")
args.IsValid = false;
else
args.IsValid=true;
}
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<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomValidator" ClientValidationFunction="chktext" ControlToValidate="TextBox1" ValidateEmptyText="True"></asp:CustomValidator>
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="CustomValidator" ClientValidationFunction="chktext" ControlToValidate="TextBox1" ValidateEmptyText="True"></asp:CustomValidator>
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