private bool ColumnEqual(object A, object B)
{
 //Compares two values to see if they are equal. Also compares DBNULL.Value.
						
	if ( A == DBNull.Value && B == DBNull.Value ) //  both are DBNull.Value
		return true; 
	if ( A == DBNull.Value || B == DBNull.Value ) //  only one is DBNull.Value
		return false; 
	return ( A.Equals(B) );  // value type standard comparison
}

if (Convert.ToString(A) == Convert.ToString(B)) 
return true
else return false