How to fix Logon failure: unknown username or bad password error in ASP.Net c#?

Question

I use ftp server. I want to load Image in ftp folder but I have an error.

Logon failure: unknown user name or bad password.

My code is here:

public string imagePathStatic = @"\\11.11.111.111\www\images\Products";
ImageCommonTemplate.PostedFile.SaveAs(imagePathStatic + ImageCommonTemplate.FileName);

I get error second row. I added some code in web.config but it doesnt fix.

 <identity impersonate="true" userName="websiteName.com" password="websiteftp"/> 

Actually I dont know what I write UserName and password part .

How to fix this error?