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Time Validation in ASP.NET TextBox

Posted by VB Developer in Resources on Sep 06, 2009

This code snippet shows how to apply validation on an ASP.NET TextBox for time.

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Option 1:

You can use a RegularExpressionValidator control.

Drag and drop a RegularExpressionValidator control on your ASP.NET page next to the control you want to validate and set it's ControlToValidate property to the ID of the TextBox.

Set ValidateExpression property : ^([1-9]|1[0-2]|0[1-9]){1}(:[0-5][0-9][aApP][mM]){1}$

Option 2:

1. Make sure AutoPostBack property of TextBox is True.

2. Write this code on TextChanged event handler of the TextBox.

Protected Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim t As DateTime
        If (DateTime.TryParse(TextBox1.Text, t) = True) Then
        Else
          ' Show your error message here.
            TextBox1.Focus()
        End If

    End Sub

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Time Validation in ASP.NET TextBox

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