通过单击按钮到form2删除数据网格视图行

Question

I have restaurantSale(form1) and I have supervisorVoidPass (form2) the problem is i cant remove the data ..(The system cant find the object)

in my form(1) is my datagridview.

then in my form 2 this is my code which this code use for deleting datagridview per row

 private void button8_Click(object sender, EventArgs e)
        {
            restaurantSale rs = new restaurantSale();
            string inpPass = "1234";
            if (voidPass.Text == inpPass)
            {

                MessageBox.Show("Void Success");
                foreach (DataGridViewRow row in rs.receiptGrid.SelectedRows)
                {
                    rs.receiptGrid.Rows.RemoveAt(row.Index);
                    rs.ShowDialog();
                    MessageBox.Show("Void Records");
                }

            }
        }

Answer 1

this line

restaurantSale rs = new restaurantSale();

creates a new instance of a form, not the one which is already open (and has some data).

the existing form should be used instead. it can be found in Application.OpenForms

restaurantSale rs = Application.OpenForms.OfType<restaurantSale>().FirstOrDefault();
if (rs == null) return;

it also makes sense to initialize rs value after password check ( if (voidPass.Text == inpPass) )