Multiply Label value with number and display in another in ASP.Net using C# and VB.Net

RichardSa says:

Label2.Text = ("20").ToString();

Change with below code.

Label2.Text = (Convert.ToInt32(Label1.Text) * 20).ToString();

Hi Richard Sa

Please refer below code.

HTML

<asp:Label ID="Label1" runat="server" Text=""></asp:Label>
<asp:Label ID="Label2" runat="server" Text=""></asp:Label>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Calculate" />

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        Label1.Text = i.ToString();
        Label2.Text = (Convert.ToDouble(Label1.Text) * 20).ToString();
    }
}

private double i
{
    get
    {
        return ViewState["i"] != null ? (double)ViewState["i"] : 1;
    }
    set
    {
        ViewState["i"] = value;
    }
}
protected void Calculate(object sender, EventArgs e)
{
    Label1.Text = (i + 1).ToString();
    Label2.Text = (Convert.ToDouble(Label1.Text) * 20).ToString();
    ViewState["i"] = i + 1;
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        Label1.Text = i.ToString()
        Label2.Text = (Convert.ToDouble(Label1.Text) * 20).ToString()
    End If
End Sub

Private Property i As Double
    Get
        Return If(ViewState("i") IsNot Nothing, CDbl(ViewState("i")), 1)
    End Get
    Set(ByVal value As Double)
        ViewState("i") = value
    End Set
End Property

Protected Sub Calculate(ByVal sender As Object, ByVal e As EventArgs)
    Label1.Text = (i + 1).ToString()
    Label2.Text = (Convert.ToDouble(Label1.Text) * 20).ToString()
    ViewState("i") = i + 1
End Sub

Screenshot