how to display first and last word into textbox

Question

 

 

  Company table as follows

Compid         Compname
1                       Mask

I have one textbox as follows
Company_username           textbox1

I have gridview as follows
In gridview i show record from company table and display into gridview

            Compid             Compname
select       1                          Mask

I want when i click the select in gridview i want to show companame first letter M and last letter K to be displayed in the textbox1.

In the textbox1 i want output as follows

Company_username Mk(textbox1)

from that how can i do in asp.net using c#