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,
   

   protected void Page_Load(object sender, EventArgs e)
   {
       if (Page.IsPostBack == false) {
           Label1.Text = DateTime.Now.ToString();
       }
   }

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
   

   <asp:TextBox ID="TextBox3" runat="server" />
   <asp:Button ID="Button1" Text="Sum" runat="server" OnClick="calculate" />
   <asp:Button ID="Button2" Text="Mul" runat="server" OnClick="calculate" />
   <asp:Button ID="Button3" Text="Divide" runat="server" OnClick="calculate" />

2. Add Following code in default.aspx.cs Page,
   

   protected void calculate(object sender, EventArgs e)
   {
       if (sender == Button1) {
           TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) + Convert.ToInt32(TextBox2.Text));
       } else if (sender == Button2) {
           TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) * Convert.ToInt32(TextBox2.Text));
       } else {
           TextBox3.Text = Convert.ToString(Convert.ToInt32(TextBox1.Text) / Convert.ToInt32(TextBox2.Text));
       }
   }