Office add-in stops working if "ASP:textbox" is used

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I want to start a function in CodeBehind I read that I just need to add "asp:" so that the C# function is called and not the js but when I add asp to my code the add-in stops working

ASP.NET

<asp:TextBox ID="txt" runat="server" OnTextChanged="txt_OnTextChanged" ></asp:TextBox>

If I remove this "asp:textbox" my code works fine but when I add it the add-in don't even start.

What I have tried:

I tried alot of things like using ajax to send over values to codebehind but it don´t works who I want it to...
Can someone please help I have rely no idea what I am doing wrong... I want to access a method in code behind on change of the textbox.

Posted 10-May-16 3:54am

Member 12512155

Updated 10-May-16 9:50am

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Member 12003400 10-May-16 9:57am

Paste your whole code here.
Are you using updatepanel?

Sergey Alexandrovich Kryukov 10-May-16 9:58am

Not clear. "Office" has nothing to do with ASP.NET.
—SA

Suvendu Shekhar Giri 10-May-16 10:00am

Have you created the project using the Visual C# -- Office Add-ins template?
As @Sergey mentioned, it has nothing to do with ASP.Net.

Please check following link if it helps-
Walkthrough: Creating Your First VSTO Add-in for Word[^]

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Patrice T · Answer 1 · 2016-05-10T09:50:00

You should learn to use the debugger as soon as possible. Rather than guessing what your code is doing, It is time to see your code executing and ensuring that it does what you expect.

The debugger allow you to follow the execution line by line, inspect variables and you will see that there is a point where it stop doing what you expect.
Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]

Used the debugger on client and server sides and see where ir stops working and probably why.