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c# - Cant Access File because it is being used by another process

I have an ASP.NET program where i am downloading a file from web using DownloadFile method of webClient Class and the do some modifications on it. then i am Saving it to another folder with a unique name.When I am getting this error

The process cannot access the file 'D:RDdotnetabcabcimageuploadimagesTempStorageempImage.jpg' because it is being used by another process

Can anyone tell me how to solve this.

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Generally, I think your code should looking something like this.

WebClient wc = new WebClient();
wc.DownloadFile("http://stackoverflow.com/Content/Img/stackoverflow-logo-250.png", "Foo.png");
FileStream fooStream;
using (fooStream = new FileStream("foo.png", FileMode.Open))
{
    // do stuff
}
File.Move("foo.png", "foo2.png");

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