Sets the location of the first byte in the range if only a portion of the 
            source object is to be copied as the part. 
            
 Declaration Syntax
 Declaration Syntax| C# | 
[ObsoleteAttribute("The With methods are obsolete and will be removed in version 2 of the AWS SDK for .NET. See http://aws.amazon.com/sdkfornet/#version2 for more information.")] public CopyPartRequest WithFirstByte( long firstByte )
 Parameters
 Parameters- firstByte (Int64)
- The value to set the FirstByte property too
 Return Value
 Return Valuethis instance
 Remarks
 Remarks
            The LastByte property must also be set or this value will be ignored.