使用C#在MySQL中更新语句

我一直在为我的工作场所建立一个小型库存系统,并偶然发现了一个我似乎无法解决的错误

 private void Update(string num,string name, string quant, string location, string category, string numquery)
    {
       // "UPDATE Inventory SET Inventorynumber='"+ num +"',Inventory_Name='"+name+"', Quantity ='"+ quant+"',Location ='"+ location+"' Category ='"+ category+"' WHERE Inventorynumber ='"+ numquery +"';";
        string query = "UPDATE Inventory SET Inventorynumber='" + Convert.ToInt16(num) + "',Inventory_Name='" + name + "', Quantity ='" + quant + "',Location ='" + location + "' Category ='" + category + "' WHERE Inventorynumber ='" + Convert.ToInt16(numquery) + "'";
        if (this.OpenConnection() == true)
        {
            MySqlCommand cmd = new MySqlCommand();
            cmd.CommandText = query;
            cmd.Connection = serverconnection;
            cmd.ExecuteNonQuery();
            this.CloseConnection();
            Bind();
        }
    }

我不知道在这里要改变什么.任何帮助,将不胜感激.