Access Textbox Properties In A Custom Validator?

Feb 10, 2010

I want to build a custom validator control that inherits from BaseValidator. It will only be used on textboxes in my asp.net application. How can I get access to the textbox itself (read properties of the textbox) within the custom validator?

Here is what I have in my EvaluateIsValid function:

Dim t As TextBox = CType(Page.FindControl(Me.ControlToValidate), TextBox)
Return t.Text.Length <= t.MaxLength

It can't seem to find the control, so it breaks with a null reference exception. Can I do this another way?



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Jul 19, 2009

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Just to test, I have only one line writer.Write("Hello World!") in the overriden "RenderContents" method in the web control.

Once added to the aspx file, the control renders the text perfectly fine and is declared in the aspx file as

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Now, when I try to access the control "_testControl" in the codebehind, I cannot compile and I get the error as "The name '_testControl' does not exist in current context.

After reading multiple posts, I tried declaring the control in my aspx codebehind as

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I can create a new instance of the _testControl in the OnInit method, but that defeats the whole purpose. I need to understand what is going on and what is the right way to solve it.

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[URL]

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Since I think this is a JavaScript issue, I'm posting that part of my code:

[Code]....

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[Code]....

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[Code]....

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[Code]....

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Jul 6, 2010

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[Code]....

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[Code]....

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[
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[code]....

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<%@ Page Language="C#" %>
<html>
<head>
</head>
<body>
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<p>
Outcome:
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<asp:TextBox id="editCallBack"
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<script runat="server">
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}
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try
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}
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{
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}
}
catch (Exception ex)
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}
}
</script>
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<asp:CustomValidator id="CustomValidator1"
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</p>
<p>
<asp:Button id="Button1" onclick="Button1_Click"
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</p>
<p>
<asp:Label id="Label1" runat="server"></asp:Label>
</p>
</form>
</body>
</html>

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Aug 10, 2010

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