Thank you all for the help. I found a work around although it may not be the ideal or correct approach but it does what I need for school project. I just update the column with the file path where it equals to sysName.
void UploadSOW()
{
string filePath = Server.MapPath(@"~/Uploads/" + FileUpload1.FileName);
FileUpload1.SaveAs(filePath);
lblResult.Text = "Your file was successfully uploaded!" + Path.GetFileName(FileUpload1.FileName).ToString();
con.Open();
SqlCommand cmd = new SqlCommand(
"UPDATE tblSystem " +
"SET sysSOW = '"+FileUpload1.FileName+"' " +
"WHERE sysName = '"+txtSysName.Text+"'", con);
cmd.ExecuteNonQuery();
cmd.Dispose();
con.Dispose();
con.Close();
FillSysGrid();
}