I am very new to solidworks API programming. I don't have idea how to code in dot net to update/change file reference between assembly and part file. here is my code...

//my code in c#
private void buildFolder(string Drawing,string Part, int rowIndex)

{
            for (int i = 0; i < dgvResultList.Rows.Count; i++)
            {
                folderSpec = dgvResultList.Rows[i].Cells["FOLDERPATH"].Value.ToString();               

                newDrwFileName = folderSpec + "\\\\"+ dgvResultList.Rows[i].Cells["FILENAME"].Value.ToString() + ".slddrw" ;               

                newPrtFileName = Path.ChangeExtension(newDrwFileName, "sldprt");               

                if (!Directory.Exists(folderSpec))              

                 {

                   Directory.CreateDirectory(folderSpec);

                   File.Copy(Drawing, folderSpec +"\\\\"+ Path.GetFileName(Drawing));                                       

                   File.Move(folderSpec + "\\\\" + Path.GetFileName(Drawing), newDrwFileName); // renaming file                   

                   File.Copy(Part, folderSpec + "\\\\" + Path.GetFileName(Part));                   

                   File.Move(folderSpec + "\\\\" + Path.GetFileName(Part), newPrtFileName ); // renaming file

               // HERE I WANT TO WRITE CODE TO REPLACE REFERENCE

                 }
            }
}

can anybody guide me please..