Question

The file Nations.txt contains the names of the 193 member nations of the United Nations. Write a program that loads the file into an array and initially displays all the nations in a listbox. Each time a letter is typed into a textbox, the program should use a LINQ query to reduce the list of displayed nations to only those that begin with the letters in the textbox. The below picture shows the status after the letters "Ma" are typed into the textbox. At any time, the user should be able to click on the name of a nation to have it appear in the textbox. United NationsL-D-X Ma Madagascar Malawi Malaysia Maldives Mali Malta Marshall slands Mauritania Mauritius

Must be done with Visual Studio. please run the programs and provide the codes that made it possible

Answer 1

Output will be like:

Form 1 Mal Macedonia Madagascar Malawi Malaysia Maldives Mali Marshall Islands Mauritania Mauritius Mexico Micronesia Moldova Monaco Mongolia Montenegro Morocco

Code will be like:

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Linq
Imports System.Windows.Forms
Imports System.IO
Imports System.Text.RegularExpressions

Private arr As String() = New String(195) {}
Private count As Integer = 0

Using reader As StreamReader = New StreamReader("TextFile1.txt")

While True
Dim line As String = reader.ReadLine()

If line Is Nothing Then
Exit While
End If

arr(count) = line
count += 1
End While
End Using
End Sub

Private Sub textBox1_TextChanged(ByVal sender As Object, ByVal e As EventArgs)
Dim searchWord As String = textBox1.Text

For i As Integer = 0 To arr.Length - 1

If arr(i).Contains(searchWord) Then
richTextBox1.Text += arr(i)
richTextBox1.Text += Environment.NewLine
End If
Next
End Sub
End Class

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