Question

I have a function to delete single rows on right click delete in a datagridview..

code:

  private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
    {

            if (e.Button == MouseButtons.Right)
            {
                var hti = dataGridView1.HitTest(e.X, e.Y);
                if (hti.RowIndex != -1)
                {
                    dataGridView1.ClearSelection();
                    dataGridView1.Rows[hti.RowIndex].Selected = true;
                }
            }          
    }

    private void DeleteRow_Click(object sender, EventArgs e)
    {
            Int32 rowToDelete = dataGridView1.Rows.GetFirstRow(DataGridViewElementStates.Selected);
            if (rowToDelete != -1)
            {
                dataGridView1.Rows.RemoveAt(rowToDelete);
                dataGridView1.ClearSelection();
            }          
    }

but now I want to delete multiple rows on selection.
First I don’t know why I cannot select multiple rows.
Second I want to delete multiple delete using the delete button and right click mouse delete.

Can someone help me?

Answer 1

Edit:
Take a look at your code. You are setting the selected row depending on the results of the HitTest method. The DataGridView property SelectedRows will determine which rows are selected. Not sure why you need to execute a HitTest, but then again perhaps you haven’t fully explained the desired functionality.

if (e.Button == MouseButtons.Right)
{
    var hti = dataGridView1.HitTest(e.X, e.Y);
    if (hti.RowIndex != -1)
    {
        dataGridView1.ClearSelection();
        dataGridView1.Rows[hti.RowIndex].Selected = true;
    }
}

Make sure that the MultiSelect property is set to true on your datagrid.

Then, you can utilize the SelectedRows property in the event of your choice:

foreach (DataGridViewRow row in DataGridView1.SelectedRows)
{
    DataGridView1.Rows.Remove(row);
}