The  Microsoft.SharePoint.WebControls  namespace of the   Microsoft.SharePoint.dll  contains a number of validation controls that can be used on application pages and web parts to validate user entry in the SharePoint controls.   The different validation controls are:   InputFormRequiredFieldValidator  InputFormRangeValidator  InputFormCompareValidator  InputFormRegularExpressionValidator  InputFormCheckBoxListValidator  InputFormCustomValidator    If you want to use these SharePoint control validators, you have to add a page directive to the page:  <%@ Register TagPrefix="spuc" Namespace="Microsoft.SharePoint.WebControls"              Assembly="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>   The following sections describe the use of the different SharePoint validation controls.      The InputFormRequiredFieldValidator control   This control ...
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