C# Reflection - changing the value of a field of a variable

Question

I have an instance of a class, I want to change an object data member of this instance only with another object of the same type (swap), due to my system c

Answer 1

in vb with generics, but rudimentary error handling:

Module somereflectionops
    Function GetFieldValue(Of OBTYPE, FIELDTYPE)(instance As OBTYPE, fieldname As String,  Optional specbindingflags As BindingFlags = BindingFlags.NonPublic Or BindingFlags.Instance) As FIELDTYPE
        Dim ot As Type = GetType(OBTYPE)
        Dim fi As FieldInfo
        Try
            fi = ot.GetField(fieldname, BindingFlags.Default Or specbindingflags)
            If fi Is Nothing Then Return Nothing
            Return fi.GetValue(instance)
        Catch ex As Exception
            Return Nothing
        End Try
    End Function

    Function SetFieldValue(Of OBTYPE, FIELDTYPE)(instance As OBTYPE, fieldname As String, value As FIELDTYPE, Optional specbindingflags As BindingFlags = BindingFlags.NonPublic Or BindingFlags.Instance) As Boolean
        Dim ot As Type = GetType(OBTYPE)
        Dim fi As FieldInfo
        Try
            fi = ot.GetField(fieldname,  BindingFlags.Default Or specbindingflags)
            If fi Is Nothing Then Return false
            fi.SetValue(instance, value)
            Return True
        Catch ex As Exception
            Return False
        End Try
    End Function
End Module

use: SetFieldValue(Of cartonclass, Integer)(cartonyoudropped, "survivingeggcount", 3)