How use Labels,Textboxes & buttons In Visual C#.Net

Use Textboxes, Labels and buttons to take two values as input and provide following features:

Add values and display result

1.       Concatenate values and display result .
2.      Convert to uppercase the concatenation of two values.
3.        Convert to lowercase the concatenation of two values. 

 

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 vp2 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void bt1_Click(object sender, EventArgs e) { int sum; sum = int.Parse(textBox1.Text) + int.Parse(textBox2.Text); lb1.Text = sum.ToString(); } private void bt2_Click(object sender, EventArgs e) { lb2.Text = textBox1.Text + textBox2.Text; } private void bt3_Click(object sender, EventArgs e) { lb3.Text=lb2.Text.ToUpper(); } private void bt4_Click(object sender, EventArgs e) { lb4.Text = lb2.Text.ToLower(); } } }