I want to dump code in Arduino uno with usb 2 TTL converter.......but I don't know how to connect it?
Please provide a detailed explanation of what you mean by "dump code".
"Dumping code in Arduino" is called upload. Is that what you're talking about?
Please add which USB-to-TTL converter (link please).
In general, the start of the upload will pull the reset-line of the Uno down (using the DTR line). To have the process automated, your USB-to-TTL converter needs to provide that signal; else you have to manually press the reset button at the start of the upload.