Index was out of range. Must be non-negative and less than the size of the collection.error while giving print from gridview data.

public partial class Form1 : Form
{
    #region Member Variables
    StringFormat strFormat; //Used to format the grid rows.
    ArrayList arrColumnLefts = new ArrayList();//Used to save left coordinates of columns
    ArrayList arrColumnWidths = new ArrayList();//Used to save column widths
    int iCellHeight = 0; //Used to get/set the datagridview cell height
    int iTotalWidth = 0; //
    int iRow = 0;//Used as counter
    bool bFirstPage = false; //Used to check whether we are printing first page
    bool bNewPage = false;// Used to check whether we are printing a new page
    int iHeaderHeight = 0; //Used for the header height
    #endregion

private void btnprint_Click(object sender, EventArgs e)
{
    //Open the print dialog
    PrintDialog printDialog = new PrintDialog();
    printDialog.Document = printDocument1;
    printDialog.UseEXDialog = true;
    //Get the document
    if (DialogResult.OK == printDialog.ShowDialog())
    {
        printDocument1.DocumentName = "Test Page Print";
        printDocument1.Print();
    }
}

private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
    try
    {
        //Set the left margin
        int iLeftMargin = e.MarginBounds.Left;
        //Set the top margin
        int iTopMargin = e.MarginBounds.Top;
        //Whether more pages have to print or not
        bool bMorePagesToPrint = false;
        int iTmpWidth = 0;

        //For the first page to print set the cell width and header height
        if (bFirstPage)
        {
            foreach (DataGridViewColumn GridCol in dataGridView1.Columns)
            {
                iTmpWidth = (int)(Math.Floor((double)((double)GridCol.Width /
                (double)iTotalWidth * (double)iTotalWidth *
                ((double)e.MarginBounds.Width / (double)iTotalWidth))));

                iHeaderHeight = (int)(e.Graphics.MeasureString(GridCol.HeaderText,
                GridCol.InheritedStyle.Font, iTmpWidth).Height) + 11;

                // Save width and height of headers
                arrColumnLefts.Add(iLeftMargin);
                arrColumnWidths.Add(iTmpWidth);
                iLeftMargin += iTmpWidth;
            }
        }
        //Loop till all the grid rows not get printed
        while (iRow <= dataGridView1.Rows.Count - 1)
        {
            DataGridViewRow GridRow = dataGridView1.Rows[iRow];
            //Set the cell height
            iCellHeight = GridRow.Height + 5;
            int iCount = 0;
            //Check whether the current page settings allows more rows to print
            if (iTopMargin + iCellHeight >= e.MarginBounds.Height + e.MarginBounds.Top)
            {
                bNewPage = true;
                bFirstPage = false;
                bMorePagesToPrint = true;
                break;
            }
            else
            {
                if (bNewPage)
                {
                    //Draw Header
                    e.Graphics.DrawString("Customer Summary",
                    new Font(dataGridView1.Font, FontStyle.Bold),
                    Brushes.Black, e.MarginBounds.Left,
                    e.MarginBounds.Top - e.Graphics.MeasureString("Customer Summary",
                    new Font(dataGridView1.Font, FontStyle.Bold),
                    e.MarginBounds.Width).Height - 13);

                    String strDate = DateTime.Now.ToLongDateString() + " " +
                    DateTime.Now.ToShortTimeString();
                    //Draw Date
                    e.Graphics.DrawString(strDate,
                    new Font(dataGridView1.Font, FontStyle.Bold), Brushes.Black,
                    e.MarginBounds.Left +
                    (e.MarginBounds.Width - e.Graphics.MeasureString(strDate,
                    new Font(dataGridView1.Font, FontStyle.Bold),
                    e.MarginBounds.Width).Width),
                    e.MarginBounds.Top - e.Graphics.MeasureString("Customer Summary",
                    new Font(new Font(dataGridView1.Font, FontStyle.Bold),
                    FontStyle.Bold), e.MarginBounds.Width).Height - 13);

                    //Draw Columns 
                    iTopMargin = e.MarginBounds.Top;
                    foreach (DataGridViewColumn GridCol in dataGridView1.Columns)
                    {
                        e.Graphics.FillRectangle(new SolidBrush(Color.LightGray),
                        new Rectangle((int)arrColumnLefts[iCount], iTopMargin,
                        (int)arrColumnWidths[iCount], iHeaderHeight));

                        e.Graphics.DrawRectangle(Pens.Black,
                        new Rectangle((int)arrColumnLefts[iCount], iTopMargin,
                        (int)arrColumnWidths[iCount], iHeaderHeight));

                        e.Graphics.DrawString(GridCol.HeaderText,
                        GridCol.InheritedStyle.Font,
                        new SolidBrush(GridCol.InheritedStyle.ForeColor),
                        new RectangleF((int)arrColumnLefts[iCount], iTopMargin,
                        (int)arrColumnWidths[iCount], iHeaderHeight), strFormat);
                        iCount++;
                    }
                    bNewPage = false;
                    iTopMargin += iHeaderHeight;
                }
                iCount = 0;
                //Draw Columns Contents 
                foreach (DataGridViewCell Cel in GridRow.Cells)
                {
                    if (Cel.Value != null)
                    {
                        e.Graphics.DrawString(Cel.Value.ToString(),
                        Cel.InheritedStyle.Font,
                        new SolidBrush(Cel.InheritedStyle.ForeColor),
                        new RectangleF((int)arrColumnLefts[iCount],
                        (float)iTopMargin,
                        (int)arrColumnWidths[iCount], (float)iCellHeight),
                        strFormat);
                    }
                    //Drawing Cells Borders 
                    e.Graphics.DrawRectangle(Pens.Black,
                    new Rectangle((int)arrColumnLefts[iCount], iTopMargin,
                    (int)arrColumnWidths[iCount], iCellHeight));
                    iCount++;
                }
            }
            iRow++;
            iTopMargin += iCellHeight;
        }
        //If more lines exist, print another page.
        if (bMorePagesToPrint)
            e.HasMorePages = true;
        else
            e.HasMorePages = false;
    }
    catch (Exception exc)
    {
        MessageBox.Show(exc.Message, "Error", MessageBoxButtons.OK,
        MessageBoxIcon.Error);
    }
}