怎么改?
[HttpException (0x80004005): The ControlToValidate property of 'xs_tbx_id ' cannot be blank.]
System.Web.UI.WebControls.BaseValidator.ControlPropertiesValid()
System.Web.UI.WebControls.BaseValidator.get_PropertiesValid()
System.Web.UI.WebControls.BaseValidator.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer)
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
System.Web.UI.Control.Render(HtmlTextWriter writer)
System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
System.Web.UI.Page.ProcessRequestMain()
小弟新手怎么改?

[解决办法]
'xs_tbx_id ' 这个属性不能空吧！
[解决办法]
-_-#，放这个控件的目的你总该知道吧，也就是说它是用来验证哪个控件内容的

比如说你要验证的是TextBox1的内容，那么选中xs_tbx_id这个控件，在右侧属性窗口里有个ControlToValidate属性，把它的值设为TextBox1就可以了