Simple textbox validation - display message is nothing is entered -

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I am very innovative for this, so here ...

I use Visual Studio I am using 05 (C #) and in my program I have a text box and a submit button. The user enters an email address and the result is then displayed by the database (this works) using ASP Gridview control.

What I am after, this is a simple part of the belief if nothing has been entered

Many thanks!

"post-text" itemprop = "text">

Use. 

  & asp: Required: Filitivistator id = "Id1" runat = "server" error message = "*" validation group = "1" controltovalend = "texttext" /> & Lt; ASP: Textbox Runat = "Server" ID = "TestTestast" />

You can use CustomValidator to display a popup, just provide it with your Javascript function.


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