Calculate Sum, Multiply, Division Of Two Numbers And Display Current Date In C#.NET

1. First, add new Website, Open Visual Studio: Select > File > New > Website.
   
   
2. Give the name of the Website like SampleWeb1.
   
   
3. Open Solution Explorer and add Web Form by right clickng on the Website name > select Add > Add New Item >Select Web form (Default.aspx).
   
   
4. Add Label on Default.aspx,
   
   Eg: <asp:Label ID="Label1" runat="server" />
   
   
5. Open Default.aspx.cs page and add following code on Page Load,
   
   1. protected void Page_Load(object sender, EventArgs e)
   2. {
   3. if (Page.IsPostBack == false) {
   4. Label1.Text = DateTime.Now.ToString();
   5. }
   6. }

Now, we learn how to calculate the sum, multiplication, and division of 2 numbers:

1. Add three textboxes and three buttons on default.aspx page,
   
   Value1: <asp:TextBox ID="TextBox1" runat="server" />
   
   Value2: <asp:TextBox ID="TextBox2" runat="server" />
   
   Answer
   
   1. <asp:TextBox ID="TextBox3" runat="server" />
   2. <asp:Button ID="Button1" Text="Sum" runat="server" OnClick="calculate" />
   3. <asp:Button ID="Button2" Text="Mul" runat="server" OnClick="calculate" />
   4. <asp:Button ID="Button3" Text="Divide" runat="server" OnClick="calculate" />
2. Add Following code in default.aspx.cs Page,
   
   1. protected void calculate(object sender, EventArgs e)
   2. {
   3. if (sender == Button1) {
   4. TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) + Convert.ToInt32(TextBox2.Text));
   5. } else if (sender == Button2) {
   6. TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) * Convert.ToInt32(TextBox2.Text));
   7. } else {
   8. TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) / Convert.ToInt32(TextBox2.Text));
   9. }
   10. }