Answer Posted / sivaprasad

1)In Array We Can Add any datatype value,Every item in
arraylist is treated as object.
2)Hashtable is collection of key,value pairs
i)Key Can be any datatype
ii)Key Cannot be null refrrence
iii)but value can be null referrence

Retrieving by key in Hashtable is faster than retrieving in
Arraylist,
Example of Arraylist:
Arraylist ar = new Arraylist();
ar.add("X");
ar.add(1);
ar.add(2);
Now if we Retrieve from Arraylist like
foreach(string str in ar)
{

}
It will Compile but it will give Runtime
Error,because '1' and '2' in Arraylist are integers.

Example Hashtable:
Hashtable ht = new Hashtable();
ht.add(1,"sample");
ht.add("2","Test");
ht.add(3,4);
foreach(Dictionaryentry dr in ht.keys.values)
{
Console.Writeline(dr.keys + "=" + dr.values);
}

The Above Code wont give any runtime Error Because We
are iterating through DictionaryEntries(Hashtable
implements IDictionary) it is Collection of Key/Value Pairs

What are the return types in c#?

911

---

What is yield c#?

813

---

Name which controls do not have events?

984

---

Does c# support properties of array types?

880

---

What is action c#?

868

---

What is deferred execution?

825

---

What is a console file?

891

---

What's difference between constants and static readonly?

1088

---

Are attributes inherited c#?

828

---

Why is it efficient to use System.string under System.Text.StringBuilder ?

935

---

What is disco?

878

---

What is indexer c#?

825

---

Can u list some style properties of List Box?

869

---

Can constructor be overloaded in c#?

826

---

What is parse method in c#?

855

---