Question

I have populated datagridview using the following method and I have added button column too:

private void populatedatagridview()
{
    categorieslist();
    productgridview.RowTemplate.Height = 130;

    var productsbycount = axe.products.GroupBy(x => x.product_Id).Select(a => new
    {
        productid = a.Key,
        productnam = a.FirstOrDefault().product_Name,
        productimage = a.FirstOrDefault().product_Image,
        productdescr = a.FirstOrDefault().product_Description,
        stockavailable = a.LongCount(),
        productprice = a.FirstOrDefault().product_Price
    });

    productbindingsource.DataSource = productsbycount;
    productgridview.DataSource = productbindingsource;              
    DataGridViewButtonColumn column = new DataGridViewButtonColumn();
    productgridview.Columns.Add(column);
    column.FlatStyle = FlatStyle.System;
    column.DefaultCellStyle.ForeColor = Color.ForestGreen;          
    column.DefaultCellStyle.Padding = new Padding(10,48,10,48);
    column.Text = "Buy";
    column.HeaderText = "Buy";
    column.UseColumnTextForButtonValue = true;
    column.Name = "btnbuy";

    productgridview.Columns[0].Visible = false;

    for (int i = 0 ; i < productgridview.Columns.Count; i++)
        if (productgridview.Columns[i] is DataGridViewImageColumn)
        {
            ((DataGridViewImageColumn)productgridview.Columns[i]).ImageLayout = DataGridViewImageCellLayout.Stretch;
            break;
        }

}

My problem is whenever I call this function, the datagrid view adds another button column so it’s automatically increasing the number of button columns.

And I have a combobox I want to populate the datagrid view depends on the combobox text. At that time I also have to call this function.

Unfortunately, it automatically added button column again and again whenever this function is called. Would anyone please help on this?

Answer 1

Change this block:

        DataGridViewButtonColumn column = new DataGridViewButtonColumn();
        productgridview.Columns.Add(column);
        column.FlatStyle = FlatStyle.System;
        column.DefaultCellStyle.ForeColor = Color.ForestGreen;
        column.DefaultCellStyle.Padding = new Padding(10, 48, 10, 48);
        column.Text = "Buy";
        column.HeaderText = "Buy";
        column.UseColumnTextForButtonValue = true;
        column.Name = "btnbuy";

to:

if (productgridview.Columns["btnbuy"] == null)
{
        DataGridViewButtonColumn column = new DataGridViewButtonColumn();
        productgridview.Columns.Add(column);
        column.FlatStyle = FlatStyle.System;
        column.DefaultCellStyle.ForeColor = Color.ForestGreen;
        column.DefaultCellStyle.Padding = new Padding(10, 48, 10, 48);
        column.Text = "Buy";
        column.HeaderText = "Buy";
        column.UseColumnTextForButtonValue = true;
        column.Name = "btnbuy";
}