Someone asked if they could set the value of a public variable field in a .NET class from within an expression shape on an orchestration.

For example:

[Serializable]
public class Class1
{
          public Class1()
          {
          }

          public string MyString;
…
}

Expression shape code:

myClass1 = new Class1();
myClass1.MyString = “XXX”;  

Orchestration does not support fields, but you can still use properties. 

So try something like below:

[Serializable]
public class Class1
{
          private string m_myString;

          public string MyString
          {
                   get
                   {
                             return m_myString;
                   }
                   set
                   {
                             m_myString = value;
                   }
          }
}

This still works..