how to read .csv file to upload to aras vault in C#

Maybe something like this?

string fileString = "test.csv";
string path = @"C:\\temp\\myupload\\" + fileString;

// Check-in File to Aras Vault
Item fileItem = inn.newItem("File", "add");
fileItem.setAttribute("doGetItem", "0");
fileItem.setProperty("filename", fileString);
fileItem.attachPhysicalFile(path);
Item checkin_result = fileItem.apply();

Item fileItem = inn.newItem("File", "add");

what is that 'inn ' object 

which class tobe used

var inn = this.getInnovator();

var inn = this.getInnovator();