Calculate Date of Retirement based on Date of Birth in ASP.Net

Hi hnmahant,

Please take reference the below code and correct your code.

HTML

BirthDate:
<asp:TextBox ID="txtDate" runat="server" Text="01/12/1984"></asp:TextBox>
<asp:Button ID="btnCalculate" runat="server" Text="Calculate" OnClick="Calculate" />
<asp:Label ID="lblRetirementDate" runat="server" />

Namespaces

C#

using System.Globalization;

Code

C#

protected void Calculate(object sender, EventArgs e)
{
    DateTime birthdate = DateTime.ParseExact(txtDate.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);
    DateTime retirementDate = DateTime.ParseExact(birthdate.AddYears(58).ToString("dd/MM/yyyy"), "dd/MM/yyyy", CultureInfo.InvariantCulture);
    lblRetirementDate.Text = new DateTime(retirementDate.Year, retirementDate.Month, 1).AddMonths(1).AddDays(-1).ToString("dd/MM/yyyy");
}

Screenshot