how to validate the dropdown list

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i have dropdownlist as follows

Batch start date Dropdownlist1(Date) Dropdownlist2(month) Dropdownlist3(year)

Issue date Dropdownlist4(Date) Dropdownlist5(month) Dropdownlist6(year)

String startdate;
DateTime Batchstartdate;

startdate = this.Dropdownlist1.Text.ToString().Trim() + "-" + this.Dropdownlist2.Text.ToString().Trim() + "-" + this.Dropdownlist3.Text.ToString().Trim();
Batchstartdate = Convert.ToDateTime(startdate.ToString());

string issuedate;
DateTime Batchissuedate;

issuedate = this.Dropdownlist4.Text.ToString().Trim() + "-" + this.Dropdownlist5.Text.ToString().Trim() + "-" + this.Dropdownlist6.Text.ToString().Trim();
Batchissuedate = Convert.ToDateTime(issuedate.ToString());

i want to validate issue date is not less than start date.

for that how can i validate using csharp.

if (startdate.ToString() < issuedate.ToString())
{
Label23.Text = "Start Date must be greater than the Issue date";
return;
}

when i run shows error as follows
Operator '<' cannot be applied to operands of type 'string' and 'string'

for that how can i do using cshrp.

Please help me.

Regards,
Narasiman P.

Posted 18-Sep-13 21:56pm

Member 8054539

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phil.o 19-Sep-13 3:59am

Why not using a DateTimePicker instead?

4 solutions

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Love 2 code · Answer 1 · 2013-09-18T21:59:00

Solution 1

Hi, you can use the < operator on DateTime itself:

C#

if (startdate < issuedate)
 {
 Label23.Text = "Start Date must be greater than the Issue date";
 return;
 }

Posted 18-Sep-13 21:59pm

Love 2 code

hypermellow · Answer 2 · 2013-09-18T22:08:00

Solution 2

Have a look at the DateTime.Compare method.

Then you could do something like:

C#

if(DateTime.Compare(Batchissuedate, Batchstartdate)>0)
{
    Label23.Text = "Start Date must be greater than the Issue date";
}

Posted 18-Sep-13 22:08pm

hypermellow

Updated 22-Sep-13 21:57pm

v2

Comments

[no name] 22-Sep-13 10:23am

if (startdate < issuedate)
{
Label23.Text = "start date must not be less than the issue date";
return;
}

when i run the above code shows error as follows

Operator '<' cannot be applied to operands of type 'string' and 'string'

please help me.

hypermellow 23-Sep-13 3:58am

Hi,

I've updated my solution above to pass your date variables into the DateTime.Compare method.

Give it a try and let me know how you get on?

Ram424 · Answer 3 · 2013-09-22T23:22:00

Solution 3

Hi,

In your code startdate and issuedate are two strings so we compare those two dates so compare your

Batchstartdate and Batchissuedate.

if(Batchstartdate <batchissuedate)>
{

Label23.Text = "Start Date must be greater than the Issue date";

}

Posted 22-Sep-13 23:22pm

Ram424

Er Daljeet Singh · Answer 4 · 2013-09-25T02:15:00

C#

if (startdate.ToString() < issuedate.ToString())
{
Label23.Text = "Start Date must be greater than the Issue date";
return;
}

just remove the .ToString() function from the condition then you code will work fine.
otherwise use this

C#

DateTime dt = Convert.ToDateTime("09/24/2013");

           if (DateTime.Compare(DateTime.Now,dt)>0)
           {
               Console.WriteLine("small");
           }