How to get the HTML form element value in ASP.NET code behind page?

To get the HTML form element value in ASP.NET Code behind file, use following code snippet.

For example:

<input type="text" name="txtFirstName" />

To get the value of txtName textbox, write following line of code.

string firstName = Request.Form["txtFirstName"].ToString();

In the same, way hidden field and other html form elements value can be retrieved.

Thanks.