C#

JoeRip wrote:

Now, the last line is going to fail, because dt.Columns[dc2].AllowDBNull is false.

public bool FillOutMyRow(out DataRow dr)
{
     if (dr == null)
     {
          return false;     
     }
     // fill out the data
     dr["first_column"] = 1;
     return true;
}

static void Main()
{
  int i = 1;
  NoRef(i);
  Console.WriteLine(i); // prints '1'

  WithRef(ref i);
  Console.WriteLine(i); // prints '2'
}

static void NoRef(int i)
{
 i = i +1;
}

static void WithRef(ref int i)
{
 i = i + 1;
}

static void Main()
{
   int i = 0;
   SetOut(out i);
   Console.WriteLine(i); // prints '1'
}

static vouid SetOut(out int i)
{
 i = 1;
}