ASP.NET

AmazonS3.PutObjectResult myResult   = amazonwsObject.PutObjectInline(BucketName, secretKey, metadata, Filedata, contentLength, null, AmazonS3.StorageClass.STANDARD, True, APIKey, GetTimeStamp(DateTime.Now), True, sign, null)

public string GetSignature(string mySecretAccessKeyId, string strOperation, DateTime myTime)
{
	Text.Encoding myEncoding = new Text.UTF8Encoding();

	// Create the source string which is used to create the digest
	string mySource = ("AmazonS3" + strOperation) + FormatTimeStamp(myTime);


	// Create a new Cryptography class using the
	// Secret Access Key as the key
	Security.Cryptography.HMACSHA1 myCrypto = new Security.Cryptography.HMACSHA1(myEncoding.GetBytes(mySecretAccessKeyId));
	
	// Convert the source string to an array of bytes
	char[] mySourceArray = mySource.ToCharArray();
	// Convert the source to a UTF8 encoded array of bytes
	byte[] myUTF8Bytes = myEncoding.GetBytes(mySourceArray);
	// Calculate the digest
	byte[] strDigest = myCrypto.ComputeHash(myUTF8Bytes);
	return Convert.ToBase64String(strDigest);
}