private void ProductMasterChoosingForm_Load(object sender, EventArgs e)
 {
     // TODO: This line of code loads data into the 'masterDB.product_type' table. You can move, or remove it, as needed.
     this.product_typeTableAdapter.Fill(this.masterDB.product_type);
     pmSelectedList = new ProductMasterCollection(bdsProductMaster);
     bdsProductMaster.ResetBindings(false);
 }
 private bool ExistInList(ProductMasterCollection collection, ProductMaster master)
 {
     foreach (ProductMaster productMaster in collection)
     {
         if(productMaster.ProductName.Equals(master.ProductName))
         {
             return true;
         }
     }
     return false;
 }