Calculate difference between current and specified year using C# and VB.Net in ASP.Net

Hi kankon,

Refer below code.

HTML

<asp:TextBox ID="civilid" runat="server" />
<asp:Button Text="Calculate" runat="server" OnClick="OnCalculate" />
<hr />
<asp:TextBox ID="result_civilid_Age" runat="server" />

Code

C#

protected void OnCalculate(object sender, EventArgs e)
{
    if (civilid.Text.Trim().Length == 12)
    {
        int year = Convert.ToInt32("19" + civilid.Text.Substring(1, 2));
        int current = DateTime.Today.Year;
        result_civilid_Age.Text = (current - year).ToString();
    }
}

VB.Net

Protected Sub OnCalculate(ByVal sender As Object, ByVal e As EventArgs)
    If civilid.Text.Trim().Length = 12 Then
        Dim year As Integer = Convert.ToInt32("19" & civilid.Text.Substring(1, 2))
        Dim current As Integer = DateTime.Today.Year
        result_civilid_Age.Text = (current - year).ToString()
    End If
End Sub

Screenshot