Compilation Error

Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0103: The name 'q20' does not exist in the current context

Source Error:

Line 179:        q18.Visible = false;
Line 180:        q19.Visible = false;
Line 181:        q20.Visible = false;
Line 182:        q21.Visible = false;
Line 183:        q22.Visible = false;

Source File: d:\PSTAR\webscreeners\2020\Satsuma_ASCEND_Migraine_US_SP\Questions.aspx.cs    Line: 181