sql server - Update Sql database via editing Textbox C# -

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i've got winform update sql database editing 2 textbox product name , product cost, doesn't update database, here sample code

     private void simplebutton5_click(object sender, eventargs e)     {         string id = combobox2.items[combobox2.selectedindex].tostring();         string name = txtprodname.text;         string cost = txtproductcost.text;         cn.open();          string query = "update [product1] set [product_name]= @product_name,[product_cost]= @product_cost [product_id]= @product_id";         sqlcommand cmd = new sqlcommand(query, cn);         cmd.parameters.addwithvalue("@product_id", id);         cmd.parameters.addwithvalue("@product_name", name);         cmd.parameters.addwithvalue("@product_price", cost);         try         {             cmd.executenonquery();             messagebox.show("update succesfully");         }         catch (exception ex)         {             messagebox.show(ex.message, application.productname, messageboxbuttons.ok, messageboxicon.error);         }         cn.close();      }

the datatype of id char, product_name nvarchar(50), porduct_cost bigint. thoughts appreciated

first, convert string value int

string cost = txtproductcost.text; costval=int.parse(cost)// costval integer

next, update database

cmd.parameters.addwithvalue("@product_price", costval);

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