C# Online Compiler | .NET Fiddle

using System; using System.Diagnostics; using System.Linq;
public static class Program
{
        //Considered Buffer.BlockCopy implementation for string[] 
	    //but conversion to bytes is one interation already all values
        //byte[] bytes = array.Select(s => Convert.ToByte(s, 16)).ToArray(); first then use blockcopy
	       
	    public static void PushStringCopyArray(ref string[] array, string pushvalue)
		{
			string[] temp = new string[array.Length];
			temp[0] = pushvalue;
			
			Array.Copy(array, 0, temp, 1, array.Length-1);
			
			array = temp;
		}
	
	    public static void PushStringArray(ref string[] array, string pushvalue)
        {
          
            string[] temp = new string[array.Length];
 			
			temp[0] = pushvalue; //push new value on top of array
	
            for (int i = 0; i < array.Length - 1; i++)
                temp[i + 1] = array[i];

            array = temp;

        } 
	    /// <summary>
        /// Pop value from top of string[] ref array
        /// </summary>
        public static string PopStringArray(ref string[] array)
        {
          	//string[] temp = new string[array.Length]; //default value is ""
			string[] temp = Enumerable.Repeat("#", array.Length).ToArray(); //set a default value

            string popvalue = array[0]; ////push new value on top of array
			
			for (int i = array.Length - 1; i >= 1; i--)
			  	temp[i - 1] = array[i];
			
	        array = temp;
			
			return popvalue; 
    	}
          	
		public static void PrintArray(ref string[] array)
		{
			for (int i = 0; i < array.Length; i++)
				Console.Write("a["+i+"]="+array[i]+",");
			Console.WriteLine();
			Console.WriteLine();
		}    
	
	public static void Main()
	{
		Stopwatch sw = new Stopwatch();
		string[] test = new string[]{"z","a","b","c"}; 
        
		Console.WriteLine("Pop/Push Array Test");
		Console.WriteLine("Arr Len="+test.Length);
		PrintArray(ref test); 
		PushStringArray(ref test, "1st");
		PrintArray(ref test);
		PushStringArray(ref test, "2nd"); 
		PrintArray(ref test);
		PushStringArray(ref test, "3rd"); 
		PrintArray(ref test);
		
		sw.Start();
		PushStringArray(ref test, "4th"); 
		sw.Stop();
		Console.WriteLine(sw.ElapsedTicks+" ticks. WOW! For loop, but still O(n)."); 
		PrintArray(ref test);
		
		sw.Start();
		PushStringCopyArray(ref test, "5th"); 
		sw.Stop();
		Console.WriteLine(sw.ElapsedTicks+" ticks. Array.Copy:  I thought this would be better."); 
		PrintArray(ref test);
		
		Console.WriteLine(PopStringArray(ref test)); 
		PrintArray(ref test);
		Console.WriteLine(PopStringArray(ref test)); 
		PrintArray(ref test);
		Console.WriteLine(PopStringArray(ref test)); 
		PrintArray(ref test);
		Console.WriteLine(PopStringArray(ref test)); 
		PrintArray(ref test);				
		Console.WriteLine(PopStringArray(ref test)); 
		PrintArray(ref test);
	}
}

 
using System; using System.Diagnostics; using System.Linq;
public static class Program
{
        //Considered Buffer.BlockCopy implementation for string[] 
        //but conversion to bytes is one interation already all values
        //byte[] bytes = array.Select(s => Convert.ToByte(s, 16)).ToArray(); first then use blockcopy
           
        public static void PushStringCopyArray(ref string[] array, string pushvalue)
        {
            string[] temp = new string[array.Length];
            temp[0] = pushvalue;
            
            Array.Copy(array, 0, temp, 1, array.Length-1);
            
            array = temp;
        }
    
        public static void PushStringArray(ref string[] array, string pushvalue)
        {
          
            string[] temp = new string[array.Length];
            
            temp[0] = pushvalue; //push new value on top of array
    