I created a Context Menu for a DataGridView is am using to manipulate data from various non-conforming Tab-delimited files. (Old financial stuff)

One of the functions I needed was the ability to move all columns to the right.

I tried to understand .Insert, .Add, and .Clone to no avail as the sharers are so far above me as coders.

Please take a look at this and give e some ideas for improvement because with long files the pause is traumatic.

        private void dgv_MoveColumnRight(DataGridView dgv, int cIndex)
        {
            dgv.ColumnCount = dgv.ColumnCount + 1;
            int cCount = dgv.ColumnCount - 2;
            if (dgv.RowCount <= 1) { return; }
            while (cCount >= cIndex)
            {
                dgv_CopyColumn(dgv, cCount);//showMe.Comment = "From: " + n1.ToString();
                dgv_PasteColumn(dgv, cCount + 1);
                //dgv.Rows[1].Cells[cCount].Value = "*";
                cCount--;
                Application.DoEvents();
            }
            for (int n = 0; n < dgv.RowCount; n++)
            {
                dgv.Rows[n].Cells[cIndex].Value = " ";
            }
        }

        List<string> colData = new List<string>();
        private void dgv_CopyColumn(DataGridView dgv, int cIndex)   
        {
            colData.Clear();
            for (int n = 0; n < dgvStatement.RowCount; n++)
            {
                if(dgv.Rows[n].Cells[cIndex].Value != null)
                {
                    colData.Add(dgv.Rows[n].Cells[cIndex].Value.ToString());
                }
                else
                {
                    colData.Add(" ");
                }
                showMe.Comment = n.ToString() + "t" + colData[n];
            }
        }

        private void dgv_PasteColumn(DataGridView dgv, int cIndex)  
        {
            if (colData.Count == 0) { return; }
            for (int n = 0; n < dgvStatement.RowCount; n++)
            {
                dgv.Rows[n].Cells[cIndex].Value = colData[n];
            }
        }

The final code will pass the list instead of having it exposed.

Thanks