Read text from RichTextBox  and save the file from save file dialog

Imports System.IO

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim FileSave As New SaveFileDialog()

        FileSave.Filter = "All files | *.* | Text files | *.txt"

        FileSave.FilterIndex = 2

        FileSave.InitialDirectory = "C:\"

        FileSave.AddExtension = True

        FileSave.DefaultExt = "txt"

        If (FileSave.ShowDialog() = Windows.Forms.DialogResult.OK) Then

            Dim File As StreamWriter

            Try

                File = New StreamWriter(FileSave.FileName)

            Catch

                MsgBox("Error open/create " & FileSave.FileName)

            End Try

            Dim i As Integer

            Try

                For i = 0 To Me.RichTextBox1.Text.Length - 1

                    If Me.RichTextBox1.Text.Chars(i) = Chr(10) Then 'Chr(10) = new line char

                        File.WriteLine()

                    Else

                        File.Write(Me.RichTextBox1.Text.Chars(i))

                    End If

                Next

            Catch

                MsgBox("Error writing file")

            End Try

            File.Close()

            MsgBox("Text saved to " & FileSave.FileName)

        Else

            MsgBox("User selected Cancel")

        End If

    End Sub

End Class