C# Error CS1503 – Argument {0}: cannot convert from ‘{1}’ to ‘{2}’

C# Error

CS1503 – Argument {0}: cannot convert from ‘{1}’ to ‘{2}’

Reason for the Error & Solution

Argument ‘number’ cannot convert from TypeA to TypeB

The type of one argument in a method does not match the type that was passed when the class was instantiated. This error typically appears along with CS1502. See for a discussion of how to resolve this error.