public void Ctor()
{
string colName = "ColName";
DataColumn col = new DataColumn();
//These should all ctor without an exception
col = new DataColumn(colName);
col = new DataColumn(colName, typeof(int));
col = new DataColumn(colName, typeof(int), null);
col = new DataColumn(colName, typeof(int), null, MappingType.Attribute);
}