Question

In: Computer Science

C# ( asp.net ) 2019 visual studio I have a dropdown option. If I choose "date"...

C# ( asp.net ) 2019 visual studio

I have a dropdown option. If I choose "date" option, I get to enter list of dates like 02/08/1990, 06/14/1890 in (mm/dd/YYYY) format.

How can I sort these dates in ascending order?. Can you provide me some code. Thank you

Expert Solution

There are so many ways to sort the date field in the dropdown.

Method 1:
---------

you can simply write the query using "ORDER BY" in your code it self. 

select * from [table name] order by convert(nvarchar,DateValidFrom,103)

Method 2 :

-------------

For this syntax first you need to add the namespace otherwise you will face an issue.Which is,

[add namespace using System.Linq;]

Syntax: var orderedDateList = date.OrderBy(x => DateTime.Parse(x)).ToList();

Here 'var' can accept any type of variable.

Method 3:

--------------

Here i am just providing an example for understanding.

<%@ Page Language="C#" AutoEventWireup="true"%>

<!DOCTYPE html>

protected void Button1_Click(object sender, System.EventArgs e)

{

List<DateTime> holidays = new List<DateTime>();

DateTime today = DateTime.Today; holidays.Add(today);

holidays.Add(today.AddDays(5));

holidays.Add(today.AddDays(1));

holidays.Add(today.AddDays(7));

holidays.Add(today.AddDays(3));

Label1.Text = "holidays.....<br /> ";

foreach (DateTime d in holidays)

{

Label1.Text += d.ToShortDateString() + "<br />";

}

var sortedholidays = holidays.OrderBy(x => x);

Label1.Text += "<br />ascending sorted holidays.........<br />";

foreach (DateTime d in sortedholidays)

{

Label1.Text += d.ToShortDateString() + "<br />";

}

</script>

<title>c# linq example - sort date List order by ascending descending</title>

</head>

<body>

<div>

<h2 style="color:DarkBlue; font-style:italic;"> c# example - sort date List order <br /> by ascending and descending </h2> <hr width="550" align="left" color="LightBlue" />

<asp:Label ID="Label1" runat="server" Font-Size="Large" >

</asp:Label> <br />

<asp:Button ID="Button1" runat="server" Text="sort date List" OnClick="Button1_Click" Height="40" Font-Bold="true" /> </div>

</form>

</body>

</html>

Method 1 is very easy process to solve your problem. As i do not know your exact code here i am providing a simple example.

venereology answered 8 months ago

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