Amazon S3 TransferUtility.Upload hangs after one file uploaded

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Amazon-S3

C#5.0

Hi everyone I'm trying to upload .csv file in amazon S3 it works fine till one file was uploaded, but after then system hangs and nothing will happen next.

I was refer this but not get right solution.

If you have right way then please let me aware.

My code is her

public static void UploadScreenShot(string FullFilePath, string DestPath, string FileName)
{
        try
        {
             TransferUtility fileTransferUtility = new TransferUtility(new AmazonS3Client(Amazon.RegionEndpoint.USEast1));
             fileTransferUtility.Upload(FullFilePath, existingBucketName, DestPath +FileName);
             fileTransferUtility.Dispose();
        }
        catch{}
}