private void button1_Click_1(object sender, EventArgs e)
 {
     if (textBox1.Text == "")
     {
         MessageBox.Show("Please insert vendor's name.");
     }
     else
     {
         DataSet ds = new DataSet();
         ds = _sqlSetup.GetData("select Name from Vendor where Name = '" + textBox1.Text + "'", false, null);
         if (ds != null)
         {
             if (ds.Tables[0].Rows.Count > 0)
             {
                 MessageBox.Show("This vendor already exists.");
             }
             else
             {
                 int insert = _sqlSetup.SetData("Insert into Vendor(idVendor, Name) values " +
                                                "((Select Top 1 idVendor from Vendor order by idVendor desc) +1,'"
                                                + textBox1.Text + "')", false, null);
                 MessageBox.Show("Vendor Added.");
                 this.Close();
                 AddMedicineStock fm = new AddMedicineStock();
                 fm.Show();
             }
         }
     }
 }
        private void button1_Click(object sender, EventArgs e)
        {
            stock_added = true;
            AddMedicineStock frm1 = new AddMedicineStock();

            frm1.RefreshDgv += new AddMedicineStock.DoEvent(fm_RefreshDgv);

            frm1.Show();
        }