什么是VB.net的InputDialog的C#版本？

using System;
using System.Windows.Forms;

public class InputDialog
{
    public static string Show(string title, string promptText)
    {
        Form inputForm = new Form();
        Label label = new Label();
        TextBox textBox = new TextBox();
        Button okButton = new Button();
        Button cancelButton = new Button();

        inputForm.Text = title;
        label.Text = promptText;
        okButton.Text = "OK";
        cancelButton.Text = "Cancel";

        label.SetBounds(9, 20, 372, 13);
        textBox.SetBounds(12, 36, 372, 20);
        okButton.SetBounds(227, 72, 75, 23);
        cancelButton.SetBounds(303, 72, 75, 23);

        label.AutoSize = true;
        textBox.Anchor = textBox.Anchor | AnchorStyles.Right;
        okButton.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
        cancelButton.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;

        inputForm.ClientSize = new Size(396, 107);
        inputForm.Controls.AddRange(new Control[] { label, textBox, okButton, cancelButton });
        inputForm.FormBorderStyle = FormBorderStyle.FixedDialog;
        inputForm.StartPosition = FormStartPosition.CenterScreen;
        inputForm.MinimizeBox = false;
        inputForm.MaximizeBox = false;
        inputForm.AcceptButton = okButton;
        inputForm.CancelButton = cancelButton;

        DialogResult dialogResult = inputForm.ShowDialog();
        return (dialogResult == DialogResult.OK) ? textBox.Text : null;
    }
}

string input = InputDialog.Show("Input Dialog", "Please enter some text:");
if (input != null)
{
    MessageBox.Show("You entered: " + input);
}
else
{
    MessageBox.Show("Input cancelled.");
}