private void rnursebutton_Click(object sender, EventArgs e)
{
nursedataGridView.DataSource = null;
nursedataGridView.Rows.Clear();
List <Nurse> nlist = da.nursedatagrid();
foreach (var item in nlist)
{
nursedataGridView.Rows.Add(item.Name, item.Contactno, item.Designation);
}
nursesearchcomboBox.Items.Clear();
nursesearchcomboBox.Items.Add("Name");
nursesearchcomboBox.Items.Add("Designation");
nursesearchcomboBox.Text = "";
nursesearchtextBox.Text = "";
rtabControl.SelectedTab = rnursetab;
}