Try placing a sql query behind the Save button e.g.
sql = "select from table where name='" + Name.Text + "' and days = '" + Days.Text + "'"
then if the SqlDataReader.HasRows (or whatever you are using) returns true you know the combination already exists.
Display an error message and don't perform the save
(NB I haven't done it here for the sake of being lazy but you should really use proper parameterised queries
rather than inserting the content of textboxes as I've done here)