Don't know the answer to your question until I know the contents of the text file. Without that knowledge, generally I would use fgets() to read a line, then parse it into its individual parts into the structure.
fscanf(fp,"%s%s%s", List[i].ID, List[i].YR, List[i].lname);
// get the first name separately because it may be composed of
// two or more names with spaces, so fscanf() will not work with this.
fgets(List[i].fname, sizeof(List[i].fname, fp);
Of course you will have to put the above in a loop after opening the file for reading.
For Each ctrl As Control In Me.Controls("pnlMainPanel").Controls
If ctrl.GetType Is GetType(System.Windows.Forms.Panel) Then
For Each subCtrl As Control In ctrl.Controls
If subCtrl.GetType Is GetType(System.Windows.Forms.TextBox) Then
If subCtrl.GetType Is ...