RadMenu hide menu item from server side

RadMenu1.FindItemByText("RadMenuItem1").Visible = false;

determine whether radscheduler is in edit mode or insert mode

Edit Mode:
"if"(!RadScheduler1.StartEditingInAdvancedForm)

Insert Mode:
"if"(!RadScheduler1.StartInsertingInAdvancedForm)

asp.net export to txt file receive error in IE when hosted in IIS6

code:

"Response".Clear();
"Response".AddHeader("content-disposition", "attachment;filename=" + FileName + ".txt");
"Response".Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
"Response".ContentType = "application/vnd.text";
"StringWriter" stringWrite = new StringWriter();
"HtmlTextWriter" htmlWrite = new HtmlTextWriter(stringWrite);
"Response".Write(strTXTFileBuilder.ToString());
"Response".End();

Error:
Internet Explorer cannot download file from .
Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later.

My Solution:
Take out the line ""Response".Cache.SetCacheability(HttpCacheability.NoCache);"

sql check existance before insert

'if' not 'exists' (select .... from .... where ....)
Begin
'Insert' Into ....... (..., ..., ...) values (..., ..., ...,)
END

rebind parent page control on radwindow close

in the Parent page add into the radwinow aspx code:

sas"<"telerik:radwindow id="rwpopup111" title="popup111" runat="server" behaviors="Close" onclientclose="OnClientClose" navigateurl="popup111.aspx">

also add javascript:

function OnClientClose(oWnd)
{
//place your code to execute, see below for my examples, in this example I rebind a grid:
var hf111 = document.getElementById("");


var masterTable1 = $find("").get_masterTableView();
masterTable1.rebind();

var masterTable = $find("").get_masterTableView();
masterTable.rebind();
//after radwindow close you may lose title of the parent page, if that is the case reset it here:
document.title="abc";

}