about array search

Question

i'm student and i start studing c# last year

i want to make windows application program

the program  will be :
                         
                                i have array contain the following values {"a",""a1,"b","b1","c","c1"}
                               
                                i want to make textbox to search in the array if the user enter the frist string of element all the element which start of this character like google search


and like this pic

please send me a message