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void BtnStartClick(object sender, System.EventArgs e)
{
}

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decimal zahl1,zahl2;

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zahl1=Convert.ToDecimal(textBox1.Text);

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ToInt32(object value); [Objekt value in Integer32 konvertieren]
ToString(object value); [Objekt value in String konvertieren]

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void BtnStartClick(object sender, System.EventArgs e)
{
decimal zahl1,zahl2;
zahl1=Convert.ToDecimal(textBox1.Text);
zahl2=Convert.ToDecimal(textBox2.Text);
}

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label1.Text=Convert.ToString(zahl1+zahl2);

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void BtnStartClick(object sender, System.EventArgs e)
{
decimal zahl1,zahl2;
zahl1=Convert.ToDecimal(textBox1.Text);
zahl2=Convert.ToDecimal(textBox2.Text);
label1.Text=Convert.ToString(zahl1+zahl2);
}

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using System;
using System.Drawing;
using System.Windows.Forms;

namespace BB_Tut
{
/// <summary>
/// Description of MainForm.
/// </summary>
public class MainForm : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.Button btnStart;
public MainForm()
{
//
// The InitializeComponent() call is required for Windows Forms designer support.
//
InitializeComponent();

//
// TODO: Add constructor code after the InitializeComponent() call.
//
}

[STAThread]
public static void Main(string[] args)
{
Application.Run(new MainForm());
}

#region Windows Forms Designer generated code
/// <summary>
/// This method is required for Windows Forms designer support.
/// Do not change the method contents inside the source code editor. The Forms designer might
/// not be able to load this method if it was changed manually.
/// </summary>
private void InitializeComponent() {
this.btnStart = new System.Windows.Forms.Button();
this.textBox2 = new System.Windows.Forms.TextBox();
this.textBox1 = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// btnStart
//
this.btnStart.Location = new System.Drawing.Point(80, 176);
this.btnStart.Name = "btnStart";
this.btnStart.Size = new System.Drawing.Size(136, 72);
this.btnStart.TabIndex = 2;
this.btnStart.Text = "Ausführen";
this.btnStart.Click += new System.EventHandler(this.BtnStartClick);
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point(168, 40);
this.textBox2.Name = "textBox2";
this.textBox2.Size = new System.Drawing.Size(96, 20);
this.textBox2.TabIndex = 1;
this.textBox2.Text = "";
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(24, 40);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(88, 20);
this.textBox1.TabIndex = 0;
this.textBox1.Text = "";
//
// label1
//
this.label1.Location = new System.Drawing.Point(48, 88);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(192, 64);
this.label1.TabIndex = 3;
//
// MainForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.label1);
this.Controls.Add(this.btnStart);
this.Controls.Add(this.textBox2);
this.Controls.Add(this.textBox1);
this.Name = "MainForm";
this.Text = "MainForm";
this.ResumeLayout(false);
}
#endregion
void BtnStartClick(object sender, System.EventArgs e)
{
decimal zahl1,zahl2;
zahl1=Convert.ToDecimal(textBox1.Text);
zahl2=Convert.ToDecimal(textBox2.Text);
label1.Text=Convert.ToString(zahl1+zahl2);
}

}
}