using System;

public class Program

{

    public static void Main()

    {

        string var1="string concat";

        string var2="example";

        int length1=var1.Length;

        int length2=var2.Length;

        char[] concat=new char[length1+length2];

        for(int i=0;i<length1;i++)

        {

            concat[i]=var1[i];

        }

        for(int i=0;i<length2;i++)

        {

            concat[i+length1]=variable2[i];

        }

    }

}