"ELEMENT 'Textbox' is not a known element This may occur if there is a compilation error or web.config is missing"

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Hi I have a textbox and other controls in my form. The problem is I get a greenline underlining my controls saying "ELEMENT 'Textbox' is not a known element This may occur if there is a compilation error or web.config is missing" But the project is running fine. Where should I look to solve this error?

Posted 2-Sep-11 3:38am

Anele Ngqandu

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Anuja Pawar Indore 2-Sep-11 10:41am

Are u using Update Panel?

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#realJSOP · Answer 1 · 2011-09-02T03:40:00

It's supposed to be TextBox (it's case-sensitive).

EDIT ==================

The green intellisense underline is merely a warning. Try doing this:

<asp:TextBox blah blah ></asp:TextBox>

Sometimes it clears up weird warnings.

Comments:

0) giving a textbox an ID of "DatePicker" is confusing. Change your ID to something more appropriate.

1) Enabled is true by default, you don't need to specify it.

2) Change your CSSClass name to something that *isn't* "textbox". Call it "textboxStyle" or something like that.

Anuja Pawar Indore · Answer 2 · 2011-09-02T04:35:00

Solution 2

Just check you may be missing closing of any other tag which is before or after your text box.

Posted 2-Sep-11 4:35am

Anuja Pawar Indore

Prashant Malav · Answer 3 · 2016-01-20T19:01:00

Just check you may be missing form tag action.

like your code is:-

<form>
<asp:textbox id="txtsubscribe" runat="server" type="text" class="text">

</form>

right code:-

<form action="#">
<asp:textbox id="txtsubscribe" runat="server" type="text" class="text">

</form>

greenline problem solve....

thankyou

"ELEMENT 'Textbox' is not a known element This may occur if there is a compilation error or web.config is missing"

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