Textbox value is not getting changed on assigning it to a value in the c# code

Question

This is the code for my Textbox (DepartureDateTB):

<asp:TextBox ID="DepartureDateTB"
             runat="server"
             CssClass="DepartureDateTB"
             ClientIDMode="Static"
             ontextchanged="DepartureDateTB_TextChanged"
             EnabledViewState="False"
             AutoPostBack="True">
</asp:TextBox>
<asp:CompareValidator ID="CompareValidator1"
                      runat="server"
                      ControlToCompare="ArrivalDateTextBox"
                      ControlToValidate="DepartureDateTB"
                      ErrorMessage="*Departure to be greater"
                      ForeColor="Red"
                      Operator="GreaterThan">
</asp:CompareValidator>

JQuery for Date Picker:

$(function () {
            $("[id$='DepartureDateTB']").datepicker({ minDate: 0, maxDate: "+30D" });
            $("[id$='DepartureDateTB']").datepicker("option", "dateFormat", "dd/mm/yy");

    });
</script>  

On Page load, I am assigning a value to the textbox from database.

Then when the user changes it, there's a postback but the changed value is not retained.

Even when I tried assigning a Session variable to it and then equate it, all I get is an empty textbox.

Session["DepDateTB"] = (Request.Form[DepartureDateTB.UniqueID]).ToString();
                DepartureDateTB.Text = Session["DepDateTB"].ToString();

And when I position a break point and run it, when I hover over the Textbox the value of it is the changed date but the textbox in the front end is again empty.

Answer 1

The reason the date wasn't getting displayed was due to the following line in the jQuery code:

$("[id$='DepartureDateTB']").datepicker("option", "dateFormat", "dd/mm/yy");

Once the date format option was removed it worked fine.

I resorted to changing the date format in my c# code.