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As simple as it sounds, it ain’t simple.

you would of thought the following would work:

SPFile file = web.GetFile(strUrl);
file.name = "mynameFilename.txt";
file.Update();

does not compute..

There are 2 ways I’ve found of accomplishing this:

1. using the SPFile.MoveTo method:

string strUrl = "http://mysharepointsite/myolddocumentlibrary/Filename.txt";
string newFileUrl = "http://mysharepointsite/mynewdocumentlibrary/mynewFilename.txt";

SPSite site = new SPSite("http://mysharepointsite");
SPWeb web = site.OpenWeb();
web.AllowUnsafeUpdates = true; // this will stop it from erroring out due to security errors
SPFile file = web.GetFile(strUrl);
file.MoveTo(newFileUrl);

2. using File.Item["Name"] method..

string strUrl = "http://mysharepointsite/myolddocumentlibrary/Filename.txt";

SPSite site = new SPSite("http://mysharepointsite");
SPWeb web = site.OpenWeb();
web.AllowUnsafeUpdates = true; // this will stop it from erroring out due to security errors
SPFile file = web.GetFile(strUrl);
file.Item["Name"] = "NewFileName.txt";

However i have found method 1 more reliable. hope this helps!

MSCRM-Admin Sharepoint move, move sharepoint file, moving items, rename files, renaming files, sharepoint rename