Question

I have a radiobutton, a gridview and a button on my form. Here is my datagridview selection_changed code sample:

private void DataGridView1_SelectionChanged(object sender, EventArgs e)
{
    if (rdb_Delete.Checked)
    {
        lbl_deleteMsg.Text = DataGridView1.SelectedRows.Count.ToString() 
                + " rows selected.";
    }
 }

I want to delete selected rows from database and refresh the datagridview when user pushes the delete button.
I have an Id column in my database but I don’t show it to the user on datagridview.

So by sql query how can I delete the selected row from my database? Here is my delete button clicked code but it doesn’t seems to work (because of selection changed event):

private void btn_Delete_Click(object sender, EventArgs e) 
{       
    if (rdb_Delete.Checked)
    {
        int count = DataGridView1.SelectedRows.Count;
        int length = DataGridView1.RowCount;
        if (!count.Equals(0))
        {
            if (confirm())
            {
                for (int i = 0; i < length; i++)
                {
                    if (DataGridView1.Rows[i].Selected)
                    {
                        //DataGridView1.SelectedRows[i].Selected = false;
                        DataGridView1.Rows.RemoveAt(i);
                        i--;
                    }
                }
            }
        }
    }
}

Edit : I also find a small answer maybe helps someone in such a case. DataGridView’s any column can be visible = false so it’ll be accessible by code such as :

int rowID = int.Parse(DataGridView1[0, selectedIndex].Value.ToString());

Answer 1

Try this:

private void btn_Delete_Click(object sender, EventArgs e) 
{       
    if (rdb_Delete.Checked)
    {
        foreach (DataGridViewRow row in DataGridView1.SelectedRows)
        {
            //delete record and then remove from grid. 
            // you can use your own query but not necessary to use rowid
            int selectedIndex = row.Index;         

            // gets the RowID from the first column in the grid
            int rowID = int.Parse(DataGridView1[0, selectedIndex].Value.ToString());
            string sql = "DELETE FROM Table1 WHERE RowID = @RowID";

            // your code for deleting it from the database
            // then your code for refreshing the DataGridView

            DataGridView1.Rows.Remove(row);
        }
    }
}