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using System;
using System.Collections;
class Example{
	public static void Main(){
		Hashtable ht=new Hashtable();
		ht.Add("naidu",200);
		ht.Add("ram",800);
		ht.Add("hello",500);
		ht.Add("hiii",6000);
		foreach(object key in ht.keys){
			Console.WriteLine(key+" "+ht[keys]);
			Cosole.WriteLine("hello".GetHashCode());
		}
	}
}

prog.cs(10,28): error CS1061: Type `System.Collections.Hashtable' does not contain a definition for `keys' and no extension method `keys' of type `System.Collections.Hashtable' could be found. Are you missing an assembly reference?
/usr/lib/mono/4.5/mscorlib.dll (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty