Compiler Error CS0119

'construct1_name' is a 'construct1', which is not valid in the given context.

The compiler detected an unexpected construct such as the following:

• A class constructor is not a valid test expression in a conditional statement.

• A class name was used instead of an instance name to refer to an array element.

• A method identifier is used as if it were a struct or class

Example

The following sample generates CS0119: 'C.B()' is a method, which is not valid in the given context. You can fix this error by changing the name of the method C.B, or using the fully qualified name for the class B like N2.B.

namespace N2
{
    public static class B
    {
        public static void X() {}
    }
}

namespace N1
{
    public class C
    {
        void B() {}
        void M() => B.X();   // CS0119
    }
}