'txtName' is not declared. It may be inaccessible due to its protection level

Question

After putting a textbox on my page when I compile it I get the above error:

\'txtName\' is not declared. It may be inaccessible due to its protection level.

Answer 1

I had the same problem when I changed my asp.net website from 3.5 to 4.0.

To solve the problem I recreated the entire website in 4.0 page by page, making sure all pages have the same names. I copied page contents for each page leaving out the top line that starts with <%@ from the 3.5 website to the 4.0 website.

I copied all the code in the page class in the code behind for for each page from the 3.5 to the 4.0 website.