Searching the index of specified object in Collection in C#

To search the index of specified object in Collection, the code is as follows −

Example

 Live Demo

using System;
using System.Collections.Specialized;
public class Demo {
   public static void Main() {
      StringCollection strCol = new StringCollection();
      strCol.Add("Accessories");
      strCol.Add("Books");
      strCol.Add("Electronics");
      strCol.Add("Books");
      Console.WriteLine("StringCollection elements...");
      foreach (string res in strCol) {
         Console.WriteLine(res);
      }
      strCol.Insert(2, "Headphone");
      Console.WriteLine("StringCollection elements...UPDATED");
      foreach (string res in strCol) {
         Console.WriteLine(res);
      }
      Console.WriteLine("Index of specific object Electronics? = "+strCol.IndexOf("Electronics"));
   }
}

Output

This will produce the following output −

StringCollection elements...
Accessories
Books
Electronics
Books
StringCollection elements...UPDATED
Accessories
Books
Headphone
Electronics
Books
Index of specific object Electronics? = 3

Example

Let us now see another example −

 Live Demo

using System;
using System.Collections.Specialized;
public class Demo {
   public static void Main() {
      StringCollection stringCol = new StringCollection();
      String[] arr = new String[] { "100", "200", "300", "400", "500" };
      Console.WriteLine("Array elements...");
      foreach (string res in arr) {
         Console.WriteLine(res);
      }
      stringCol.AddRange(arr);
      Console.WriteLine("Does the specified string is in the StringCollection? = "+stringCol.Contains("800"));
      Console.WriteLine("Total number of elements = "+stringCol.Count);
      Console.WriteLine("Iterating through StringCollection = "+stringCol.Count);
      StringEnumerator myenum = stringCol.GetEnumerator();
      while (myenum.MoveNext())
      Console.WriteLine(myenum.Current);
      Console.WriteLine("Index of specific object 500? = "+stringCol.IndexOf("500"));
      Console.WriteLine("Index of specific object 1000? = "+stringCol.IndexOf("1000"));
   }
}

Output

This will produce the following output −

Array elements...
100
200
300
400
500
Does the specified string is in the StringCollection? = False
Total number of elements = 5
Iterating through StringCollection = 5
100
200
300
400
500
Index of specific object 500? = 4
Index of specific object 1000? = -1