System.Data.ForeignKeyConstraint.NonVirtualCheckState C# (CSharp) Méthode

        private void NonVirtualCheckState()
        {
            if (_DataSet == null)
            {
                // Make sure columns arrays are valid
                _parentKey.CheckState();
                _childKey.CheckState();

                if (_parentKey.Table.DataSet != _childKey.Table.DataSet)
                {
                    throw ExceptionBuilder.TablesInDifferentSets();
                }

                for (int i = 0; i < _parentKey.ColumnsReference.Length; i++)
                {
                    if (_parentKey.ColumnsReference[i].DataType != _childKey.ColumnsReference[i].DataType ||
                        ((_parentKey.ColumnsReference[i].DataType == typeof(DateTime)) && (_parentKey.ColumnsReference[i].DateTimeMode != _childKey.ColumnsReference[i].DateTimeMode) && ((_parentKey.ColumnsReference[i].DateTimeMode & _childKey.ColumnsReference[i].DateTimeMode) != DataSetDateTime.Unspecified)))
                        throw ExceptionBuilder.ColumnsTypeMismatch();
                }

                if (_childKey.ColumnsEqual(_parentKey))
                {
                    throw ExceptionBuilder.KeyColumnsIdentical();
                }
            }
        }