public void ReplaceColumn(ColumnExpression existingColumn, ColumnExpression newColumn)
{
int index = _columns.IndexOf(existingColumn);
if (index != -1)
{
_columns[index] = newColumn;
int baseIndex = ExpressionList.IndexOf(existingColumn);
ExpressionList[baseIndex] = newColumn;
}
}
public void AppendColumn(ColumnExpression column)
{
_columns.Add(column);
if (requiresColumnSeperator)
Append(",");
Append(column);
requiresColumnSeperator = true;
}