To implement VB like Input Box in C# you may use the following code:

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace zSharp.Util
{
public partial class InputBox : Form
{
public static DialogResult Show(string Prompt, string Title, string Default, int XPos, int YPos, ref string value)
{
//InitializeComponent();

Form form = new Form();
Label label = new Label();
TextBox textBox = new TextBox();
Button buttonOk = new Button();
Button buttonCancel = new Button();

form.Text = Title;
label.Text = Prompt;
textBox.Text = Default;


buttonOk.Text = "OK";
buttonCancel.Text = "Cancel";
buttonOk.DialogResult = DialogResult.OK;
buttonCancel.DialogResult = DialogResult.Cancel;

label.SetBounds(9, 20, 372, 13);
textBox.SetBounds(12, 36, 372, 20);
buttonOk.SetBounds(228, 72, 75, 23);
buttonCancel.SetBounds(309, 72, 75, 23);

label.AutoSize = true;
textBox.Anchor = textBox.Anchor | AnchorStyles.Right;
buttonOk.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
buttonCancel.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;

form.ClientSize = new Size(396, 107);
form.Controls.AddRange(new Control[] { label, textBox, buttonOk, buttonCancel });
form.ClientSize = new Size(Math.Max(300, label.Right + 10), form.ClientSize.Height);
form.FormBorderStyle = FormBorderStyle.FixedDialog;
form.StartPosition = FormStartPosition.CenterScreen;
form.MinimizeBox = false;
form.MaximizeBox = false;
form.AcceptButton = buttonOk;
form.CancelButton = buttonCancel;

if ((XPos > 0) || (YPos > 0))
{
form.StartPosition = FormStartPosition.Manual;
form.Left = XPos;
form.Top = YPos;
}

DialogResult dialogResult = form.ShowDialog();
value = textBox.Text;
return dialogResult;
}

}

}
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To call the function use:

string result = string.Empty;
if ((zSharp.Util.InputBox.Show( "Enter A Value", this.Text, "First", 500, 500,ref result)) == DialogResult.OK)
{
MessageBox.Show(result);
}