單項(xiàng)選擇題

You are implementing a read-only page that includes the following controls.
You disable view state to improve performance. You need to ensure that the page is updated to display the latest data when the user clicks the refresh button. Which code segment should you use?（）

A.protected void Page_PreInit（object sender， EventArgs e） { if （!IsPostBack） { gvCustomers.DataSource = GetCustomers（）； gvCustomers.DataBind（）； } }
B.protected void Page_Load（object sender， EventArgs e） { gvCustomers.DataSource = GetCustomers（）； gvCustomers.DataBind（）； }
C.protected void gvCustomers_DataBinding（object sender， EventArgs e） { gvCustomers.DataSource = GetCustomers（）； gvCustomers.DataBind（）； }
D.protected void Page_PreRender（object sender， EventArgs e） { if （!IsPostBack） { gvCustomers.DataSource = GetCustomers（）； gvCustomers.DataBind（）； } }

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You are implementing an ASP.NET page in an e-commerce application. Code in abtnAddToCart_Click event handler adds a product to the shopping cart. The page should check the status of the shopping cart and always show a cart icon when one or more items are in the shopping cart. The page should hide the icon when the shopping cart has no items. You need to add an event handler to implement this requirement. Which event handler should you add？（）

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You are implementing a read-only page that includes the following controls. You disable view state to improve performance. You need to ensure that the page is updated to display the latest data when the user clicks the refresh button. Which code segment should you use?（）

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99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

You are implementing a read-only page that includes the following controls.
You disable view state to improve performance. You need to ensure that the page is updated to display the latest data when the user clicks the refresh button. Which code segment should you use?（）