希望txtquantity，price，totalPrice是多变的

hope txtquantity,price,totalPrice are variabeles

int quantity = int.Parse(txtquantity);
    float price =float.Parse(price);
    float totalprice = float.Parse(totalPrice);

您可能意味着以下内容（其中价格， totalprice 和 txtquantity 是对象）：

You probably mean the following (where price, totalprice and txtquantity are objects):

protected void totalprice()
    {
        int quantity = int.Parse(txtquantity.Text);
     float price =float.Parse(price);
     float totalprice = float.Parse(totalPrice);
     totalprice=quantity * price;
}

您需要在C＃中学习类型转换。看看这些：



http： //msdn.microsoft.com/en-us/library/ms173105.aspx [ ^ ]



http://msdn.microsoft.com/en-us/library/ms173105%28v=vs.80%29.aspx [ ^ ]



希望它有所帮助：）

You need to learn the Type casting in C#. Have a look at these:

http://msdn.microsoft.com/en-us/library/ms173105.aspx[^]

http://msdn.microsoft.com/en-us/library/ms173105%28v=vs.80%29.aspx[^]

hope it helps :)