How to hide a control using javascript
document.getElementById(‘<id>’).style.visibility=’hidden’;
How to emit client-side javascript blocks from VB.NET/C#
The RegisterStartupScript method emits the script just before the closing tag of the Page object’s <form runat= server> element. VB.NET RegisterStartupScript(‘Sample’, ‘<SCRIPT Language=’javascript’>alert(’Hello World’);</SCRIPT>’) C# RegisterStartupScript(‘Sample’, ‘<SCRIPT Language=’javascript’>alert(’Hello World’);</SCRIPT>’); Alternatively, use the RegisterClientScriptBlock method which emits the client-side script just after the opening tag of the Page object’s <form runat= server> element.
How can I see the Trace messages?
For Page Level Tracing specify the Page Directive as <%@ Page Trace=’true’ %> You can view the page on which trace is enabled to true to see the details. For Application Level Tracing modify web.config as <configuration> <system.web> <trace enabled=’true’ requestLimit=’10’ pageOutput=’false’ traceMode=’SortByTime’ localOnly=’true’ /> </system.web> </configuration> You can view the Trace at http://<server>/<webApplicationName>/trace.axd
How can I have a particular Web page in an ASP.NET application which displays its own error page.
This can be done by setting the ErroPage attribute of Page Directive or ErrorPage property of Page Class to the desired Custom Error Page <%@Page Language=’C#’ ErrorPage=’specificerropage.htm’%> In web.config <customErrors mode=’On’ />
How to redirect the user to the friendly error-handler page when an Application error occurs
Modify web.config as <customErrors mode=’On’ defaultRedirect=’errorpage.aspx’ /> The <customErrors> configuration section supports an inner <error> tag that associates HTTP status codes with custom error pages. For example: <customErrors mode=’On’ defaultRedirect=’genericerror.htm’> <error statusCode=’404′ redirect=’pagenotfound.aspx’/> <error statusCode=’403′ redirect=’noaccess.aspx’/> </customErrors> For more details refer <customErrors> Element