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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.

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  
    }
}
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