Only allow user to click first datagridview row C#

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Is it possible to only allow the user to select the first item in the datagridview box. So far this is the code I have, blocks all use - including the first row...

private void productionDataGridView_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
    if (productionDataGridView.SelectedRows.Count <= 1)
    {
        MessageBox.Show("Please select the first item in list");
    }
    else if (productionDataGridView.SelectedRows.Count == 0)
    {
        productionDataGridView.CurrentRow.Cells[4].Value.ToString().Split(',').ToList().ForEach(r => listBox2.Items.Add(r.Trim()));
        OrderIDTxt.Text = this.productionDataGridView.CurrentRow.Cells[0].Value.ToString();

    }
}

What I have tried:

re arranging code and google - but theres not much information about it

Posted 25-Apr-18 0:07am

Member 13765884

Updated 25-Apr-18 1:31am

v3

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Richard MacCutchan 25-Apr-18 7:01am

Just check the row number when the user tries to select one. If it is anything other than the first row then show an error message.

Member 13765884 25-Apr-18 7:07am

I thought that is what I have done already

Richard MacCutchan 25-Apr-18 7:12am

I don't quite understand your code. Why are you checking the Count instead of the row number?

F-ES Sitecore 25-Apr-18 7:18am

if (productionDataGridView.SelectedRows.Count <= 1)
{
// this
}
else if (productionDataGridView.SelectedRows.Count == 0)
{
// that
}

"that" will never be called because if productionDataGridView.SelectedRows.Count is 0 then it will go into "this". Basic debugging will show you these things.

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OriginalGriff · Answer 1 · 2018-04-25T01:22:00

Um.

if (productionDataGridView.SelectedRows.Count <= 1)
{
    MessageBox.Show("Please select the first item in list");
}

So if he selects anything, the count will be one or more regardless of the row he selects...

Plus, Double click isn't the only way to select a row: a single click will do it, as will a single click followed by CTRL and a second row single click, or ...

Instead, handle the SelectionChanged event:

private void myDataGridView_SelectionChanged(object sender, EventArgs e)
    {
    DataGridView dgv = sender as DataGridView;
    if (dgv != null)
        {
        DataGridViewSelectedRowCollection selected = dgv.SelectedRows;
        if (selected.Count != 1 || selected[0].Index != 0)
            {
            dgv.ClearSelection();
            }
        }
    }

And the user can't select anything except the first row.

Maciej Los · Answer 2 · 2018-04-25T01:32:00

Please, read the documentation! DataGridView.SelectedRows Property (System.Windows.Forms)[^] gets the collection of rows selected by the user, but you need to find out that CurrentRow[^] is first row (Rows[0])!
I'd suggest to use this event: DataGridView.SelectionChanged Event (System.Windows.Forms)[^]

C#

if(productionDataGridView.CurrentRow != productionDataGridView.Rows[0])
{
    //MessageBox.Show("Please select the first item in list");
    productionDataGridView.CurrentCell = productionDataGridView.Rows[0].Cells[e.ColumnIndex]; //change selection to first row
}

For further details, please see:
How to: Get the Selected Cells, Rows, and Columns in the Windows Forms DataGridView Control | Microsoft Docs[^]
DataGridView.CurrentCell Property (System.Windows.Forms)[^]
DataGridViewCell Class (System.Windows.Forms)[^]

Only allow user to click first datagridview row C#

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