I am providing demo with Textbox having date i.e. 16/09/2014 on button click event it's compare System DateTime. Convert Datetime function uses CultureInfo() to convert string to datetime format.
Please refer the following code:
HTML
<div>
<asp:TextBox ID="txtDate" runat="server" Text="16/09/2014"></asp:TextBox>
<asp:Button ID="btnCompare" Text="Compare" runat="server" OnClick="Compare" />
<br />
<asp:Label ID="lblMessage" runat="server"></asp:Label>
</div>
Namespace
using System.Globalization;
C#
protected void Compare(object sender, EventArgs e)
{
DateTime currentDate = DateTime.Now;
DateTime compareDate = Convert.ToDateTime(this.txtDate.Text.Trim(), new CultureInfo("en-GB"));
string message = string.Empty;
if (currentDate > compareDate)
{
message = "Current date is greater than input date";
}
if (currentDate < compareDate)
{
message = "Current date is less than input date";
}
if (currentDate == compareDate)
{
message = "Current date is equal to input date";
}
ClientScript.RegisterClientScriptBlock(typeof(string),"message","alert('"+message+"')",true);
}
Namespace
Imports System.Globalization
VB.Net
Protected Sub Page_Load(sender As Object, e As EventArgs)
If Not Me.IsPostBack Then
Me.txtDate.Text = "16/09/2014"
End If
End Sub
Protected Sub Compare(sender As Object, e As EventArgs)
Dim currentDate As DateTime = DateTime.Now
Dim message As String = String.Empty
If currentDate > compareDate Then
message = "Current date is greater than input date"
End If
If currentDate < compareDate Then
message = "Current date is less than input date"
End If
If currentDate = compareDate Then
message = "Current date is equal to input date"
End If
ClientScript.RegisterClientScriptBlock(GetType(String), "message", (Convert.ToString("alert('") & message) + "')", True)
End Sub