how to find out entered last 3 same value in array in c#

Question

Hi all ,

 

 

    how to find out last enter three same value in array,value enter from textbox on buttion click store  like example...

 

example 

 

arr[0]=12;

arr[1]=65;

arr[2]=98;

arr[3]=12;

arr[4]=65;

arr[5]=98;

arr[6]=56;

arr[7]=56;

arr[8]=56;

 

if match last same value ..... else "Error"

 

arr[6]=56;

arr[7]=56;

arr[8]=56;

 

thanks

 

Rajveer Singh