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You create a Web Form. The Web Form uses the FormView control to enable a user to edit a record in the database. When the user clicks the Update button on the FormView control, the application must validate that the user has entered data in all of the fields. You need to ensure that the Web Form does not update if the user has not entered data in all of the fields.
Which code segment should you use？（）

You have a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Server1 runs a custom application. Users report that the performance of Server1 has decreased significantly during the last 30 minutes. You need to identify the current processor and memory usage for each process running on Server1. Which tool should you use? （） Event Viewer。 Task Manager。 Query Process。 System Configuration Utility。 自杀伤与他杀伤的鉴别 Photoshop 中，关于“图像>调整>去色”命令的使用，下列描述哪些是正确的？ （） 使用此命令可以在不转换色彩模式的前提下，将彩色图像变成灰阶图像，并保留原来像素的亮度不变。 如果当前图像是一个多图层的图像，此命令只对当前选中的图层有效。 如果当前图像是一个多图层的图像，此命令会对所有的图层有效。 此命令只对像素图层有效，对文字图层无效，对使用图层样式产生的颜色也无效。 简述突变基因定向选择的基本过程。 带电测量架空线路对地距离应用（） 皮尺。 带绝缘的导线。 清洁干燥的尼龙绳。

You create a Web Form. The Web Form uses the FormView control to enable a user to edit a record in the database. When the user clicks the Update button on the FormView control, the application must validate that the user has entered data in all of the fields. You need to ensure that the Web Form does not update if the user has not entered data in all of the fields.
Which code segment should you use？（）