string ColumnName table Columns ColumnIndex ColumnName string AllSort

string ColumnName = table.Columns[e.ColumnIndex].ColumnName;
            string AllSort = "";
            bool cond = true;

            for (int i = 0; i < Sort.Count; i++)
            {
                if (Sort[i] == ColumnName + " DESC")
                {
                    Sort.RemoveAt(i);
                    cond = false;
                    break;
                }

                if (Sort[i] == ColumnName)
                {
                    Sort[i] += " DESC";
                    cond = false;
                    break;
                }
            }

            if (cond)
            {
                Sort.Add(ColumnName);
            }

            for (int i = 0; i < Sort.Count; i++)
            {
                AllSort += Sort[i];
                if (i != Sort.Count - 1) AllSort += ",";
            }

            bindingSource1.Sort = AllSort;