Add regular expression to the text box.
<asp:TextBox ID="txtDescription" runat="server" TextMode="MultiLine" Width="99%"
Height="50px"></asp:TextBox>
<asp:RequiredFieldValidator ID="rfvdescription" runat="server" ErrorMessage="Enter the Description" Display="Dynamic"
ControlToValidate="txtdescription" ValidationGroup="submit"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="revDescription" runat="server" ControlToValidate="txtDescription"
ErrorMessage="Enter 1000 characters or less These ^<>`~!@\}%;_^{* characters Not allowed."
ValidationExpression="^[^<>`~!@\}%;_^{*]{0,1000}$"></asp:RegularExpressionValidator>
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