Im down to my last few conversions for my project

im trying to rename a cell in a datagridview to "un" if it meets certian critera

the "problem im running into is the line


userdgv["department", index] = "UN";
gives
Cannot implicitly convert type 'string' to System.Windows.Forms.DataGridViewCell'

okay so no big deal so i tried

userdgv["department", index] = (DataGridViewCell)"UN";
and got
Cannot convert type 'string' to 'System.Windows.Forms.DataGridViewCell'

some not sure how to convert it if i cant do it manualy or implicitly