Question

I have a datagrid view which is editable. I’m getting the value of a cell and then calculate the value of another cell. To do this I have handled CellEndEdit and CellBeginEdit events.

quantity = 0, quantity1 = 0, quantity_wt1 = 0, quantity_wt = 0, ekundag = 0;
private void grdCaret_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
    try
    {
        string value = grdCaret.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
        if (e.ColumnIndex == 1)
        {
            int val = int.Parse(value);
            quantity = val;
            ekundag = ekundag + quantity;
            tbTotDag_cr.Text = ekundag.ToString();
        }

        if (e.ColumnIndex == 2)
        {
            float val = float.Parse(value);
            total = val;
            ekunrakam = ekunrakam + total;
            tbTotPrice_cr.Text = ekunrakam.ToString();
        }
        grdCaret.Columns[3].ReadOnly = false;
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message.ToString());
    }
}

private void grdCaret_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
{
    rate = 0;
    quantity1 = quantity;
    total1 = total;
    rate = (total1 / quantity1);
    if (e.ColumnIndex == 3)
    {
        grdCaret.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = rate.ToString();
        grdCaret.Rows[e.RowIndex].Cells[e.ColumnIndex].ReadOnly = true;
        //  quantity = 0;
        //   total = 0;
    }
}

In the grid I have columns as quantity, total and rate. I get the above error here:

if (e.ColumnIndex == 1)
{
    int val = int.Parse(value);
    quantity = val;
    ekundag = ekundag + quantity;
    tbTotDag_cr.Text = ekundag.ToString();
}

When I enter quantity and click on the total column in gridview. Please help me fix this

Answer 1

AFAIK the int.Parse() function can possibly cause this kind of exceptions.

Have you tried to check the value in the cell? Isn’t it possible, that some other characters are in the cell, not only the numbers? White spaces for example.