how to change the label text if date displayed in textbox2 is greater than textbox1?

I have textbox in my asp.net 3.5 VB.net webform

in my textbox1 the text is : 30-Dec-2010, 06:00:00 PM

i want when the date in textbox is greater tha开发者_Python百科n textbox1 then the Label text would be "No REfund ! Sorry"

How to do this

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You should use ASP.Net CompareValidator for this purpose. You can check both on client- and serverside. Besides i would recommend not to have Date AND Time in one Textbox. That makes it more difficult to validate and it's not standard, so it might be confusing and error-phrone for users.

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<asp:CompareValidator ID="CompareValidator1" runat="server" ControlToCompare="TextBox1" ControlToValidate="TextBox2" Type="Date" Operator="GreaterThan" runat="server" ErrorMessage="No REfund ! Sorry" EnableClientScript="true" ></asp:CompareValidator>
<asp:Button ID="BtnPostback" runat="server" Text="postback" />

On the serverside you should also trigger the validation(f.e. if javascript is disabled):

Private Sub BtnPostback_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles BtnPostback.Click
     Page.Validate()
     If Me.IsValid Then
         'Do something f.e. save'
     End If
End Sub

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CompareValidator Class

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It would be better if you do it using javascript because this functionality does not require postback. A similar question has been posted on stackoverflow which compares two dates using javascript. Check it out here. You just need to extend it to incorporate assigning text to the label.