To validate a time entry with a hhmm format you will need to use regular expression. Here's how:

1. Add a text box to the page.

<asp:TextBox ID="txtTimeEntry" width="40px" maxlength="4" runat="server" />

2. Then next add a RegularExpressionValidator control to the page.

Put in all the requirement informations such as ControlToValidate, ErrorMessage, runat and ValidationExpression.

3. Ensure the validation expression string is similar to the below.

ValidationExpression="^([0-1][0-9]|[2][0-3])([0-4][0-9])$"

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