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<asp:TextBox ID="txtTest" runat="server" BackColor="#FF9966" Width="130px" MaxLength="1"></asp:TextBox>
<cc1:FilteredTextBoxExtender ID="txtbrithday_FilteredTextBoxExtender"
runat="server"
TargetControlID="txtTest" ValidChars="是否">
</cc1:FilteredTextBoxExtender>
string str = this.TextBox.Text.Trim();
bool b = Regex.IsMatch(str,"^是|否$");
if(b)
{//重新输入}
if(textVal=='是'|textVal==‘否’)
{
your code
}