Web Forms :: Enabling A Button Via TextChanged?

May 12, 2010

once again (as a novice to Visual Studio/C#/ASP, coming from a Delphi background) I am struggling to find an answer to what I imagine must be a simple problem?

I have a webpage with only 2 controls, Textbox1 and Button1. On the Page_Load , I have a line of code which says:

[Code]....

All I want to do is to be able to enable/disable the button depending upon whether or not Textbox1 contains anything. As a newcomer, I thought the answer was simple:

[Code]....

but I should really have known by now that there is NO such things as "simple" when it comes to Visual Studio / C# / ASP for someone transferring from Delphi after 8 years!!

From googling, I can see that if I set the value of AutoPostBack for TextBox1 to true then the button will be en/disabled when control leaves the TextBox. But surely there must be a way to do this while control remains with the TextBox?

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