C# Equivalent to Java's instanceof

The java.lang.Class.isInstance() determines if the specified Object is assignment-compatible with the object represented by this Class

Java's isInstance() method's equivalent in C# is IsAssignableFrom().

Another simplest way for isInstance() equivalent is −

bool res = (ob is DemoClass);

You can also work with Type.IsInstanceOfType for the same result −

ob.GetType().IsInstanceOfType(otherOb)