Uploading an image using AutoIT in selenium c# driver

//Creating an object
AutoItX3Lib.AutoItX3 autoIt = new AutoItX3();

//Mention the name of the active/opened window
            autoIt.WinActivate("Open");
//Path of the image /file to upload
            autoIt.Send("C:\\Users\\Dell\\Documents\\image1.jpg\\");  //Use double back slash
            Thread.Sleep(600);
            autoIt.Send("{Enter}");