Find An Item In List Using VB.NET

In this article I explain how to find specified item from list using vb.net.
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Find an Item

The Contains method checks if the specified item is already exists in the List. The following code snippet checks if an item is already exits.

If DepartmentList.Contains("Service") Then

            Console.WriteLine("Department found!")

End If

The IndexOf method returns the first index of an item if found in the List.

Dim idx As Integer = DepartmentList.IndexOf("Testing")

The LastIndexOf method returns the last index of an item if found in the List.

idx = DepartmentList.LastIndexOf("Service")

 

The following code snippet shows how to use the Contains, the IndexOf and the LastIndexOf methods.

 

Imports System.Text

Imports System.IO

Imports System.Collections.Generic

Module Module1

    Sub Main()

        Dim DepartmentList As New List(Of String)()

        DepartmentList.Add("Service")

        DepartmentList.Add("Finance")

        DepartmentList.Add("Maintenance")

        DepartmentList.Add("Testing")

        DepartmentList.Add("HR")

        DepartmentList.Add("Service")

 

        ' Contains - Check if an item is in the list

        If DepartmentList.Contains("Service") Then

            Console.WriteLine()

            Console.WriteLine("Department found!")

        End If

        ' Find an item and replace it with new item

        Dim idx As Integer = DepartmentList.IndexOf("Testing")

        If idx >= 0 Then

            DepartmentList(idx) = "New Department"

        End If

        Console.WriteLine()

        Console.WriteLine(vbLf & "IndexOf ")

        For Each department In DepartmentList

            Console.WriteLine(department)

        Next

        ' Find Last index of

        idx = DepartmentList.LastIndexOf("Service")

        If idx >= 0 Then

            DepartmentList(idx) = "New Service"

        End If

        Console.WriteLine()

        Console.WriteLine()

        Console.WriteLine(vbLf & "LastIndexOf ")

        For Each Department In DepartmentList

            Console.WriteLine()

            Console.WriteLine(Department)

        Next

        Console.ReadLine()

    End Sub

End Module

 

Output:


Find-item-in-list-in-vb.net.jpg

 

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