Переведите с VB на C#

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Linq
Imports System.Text
Imports System.Windows.Forms
Imports System.Diagnostics
Imports System.IO
 
Public Class Form6
    Public Sub refr()
        Dim ginfo As New StreamReader("history\" + HistoryTextBox.Text)
        TextBox1.Text = ginfo.ReadToEnd()
        ginfo.Close()
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Close()
    End Sub
 
    Private Sub Form6_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'KursachDataSet.t_goroda_rb' table. You can move, or remove it, as needed.
        Me.T_goroda_rbTableAdapter.Fill(Me.KursachDataSet.t_goroda_rb)
        HistoryTextBox.Visible = False
        GerbTextBox.Visible = False
    End Sub
 
    Private Sub GerbTextBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GerbTextBox.TextChanged
        PictureBox1.ImageLocation = ("pic\" + GerbTextBox.Text)
    End Sub
 
    Private Sub HistoryTextBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles HistoryTextBox.TextChanged
        refr()
    End Sub
 
End Class