CS1061 'IJsonHelper' does not contain a definition for 'Encode' and no accessible extension method 'Encode' accepting a first argument of type 'IJsonHelper' could be found (are you missing a using directive or an assembly reference?) code example
Example: CS1061 C# 'EventArgs' does not contain a definition for 'KeyCode' and no accessible extension method 'KeyCode' accepting a first argument of type 'EventArgs' could be found (are you missing a using directive or an assembly reference?)
(object sender, KeyEventArgs e)