Compiler Warning (level 1) CS1691

'number' is not a valid warning number

A number that was passed to the #pragma warning preprocessor directive was not a valid warning number. Verify that the number represents a warning, not an error or another sequence of characters.

Example

The following example generates CS1691.

// CS1691.cs  
public class C  
{  
    int i = 1;  
    public static void Main()  
    {  
        C myC = new C();  
#pragma warning disable 151  // CS1691  
// Try the following line instead:  
// #pragma warning disable 1645
        myC.i++;  
#pragma warning restore 151  // CS1691  
// Try the following line instead:  
// #pragma warning restore 1645
    }  
}