How Can check two string date in c# which one i greater than

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how to check and compare both date and Month and year and finally only come output DeactivationDate is greter than ActivationDate that only come on output.

C#

string strCon = GetConnectionString();
          OleDbConnection objCon = new OleDbConnection(strCon);
          string objcmd = &quot;select TblBill.SlNo,TblBillNew.EmployeeNo,TblBill.EmployeeName,TblBill.CardNo,TblBill.DepartmentName,left(TblBill.DeactivationDate,10)as DeactivationDate,TblBill.DeactivationTime from TblBill LEFT JOIN TblBillNew ON TblBill.CardNo=TblBillNew.CardNo where  TblBill.DeactivationDate &lt;&gt;&#39;&#39; And TblBill.DeactivationDate &gt; TblBill.ActivationDate;&quot;;
          objCon.Open();
          OleDbDataAdapter objAdpter = new OleDbDataAdapter(objcmd, objCon);
          DataTable dt = new DataTable();
          objAdpter.Fill(dt);
          objCon.Close();
          return dt;

Posted 28-Sep-13 2:28am

Sharathkumar k.r

Updated 28-Sep-13 3:19am

Anurag Sinha V

v2

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OriginalGriff · Answer 1 · 2013-09-28T03:25:00

The answer is: don't.
Comparing strings always works in string order:

1
10
11
...
2
20
21
...

Which is generally pretty useless for any practical purpose.

Instead, store your dates as Date or DateTime fields - that way you can compare them directly, enter only valid values, and return them as dates to your external code for formatting as the user wants: you don't need to look at it each time and compare what it might be against the users currently preferred display settings.

Anurag Sinha V · Answer 2 · 2013-09-28T03:24:00

Solution 1

You can use a TimeSpan object to store the subtraction of a date with another. TimeSpan gives the output in integer format.

C#

TimeSpan ts=new TimeSpan();
DateTime dt1=Convert.ToDateTime(date1);
DateTime dt2=Convert.ToDateTime(date2);

ts=dt1.Subtract(dt2);//Result in integer format
if(ts>0)
{
Response.Write("dt1 is greater than dt2");
}
else
{
Response.Write("dt1 is less than or equal to dt2");
}

-Anurag

Posted 28-Sep-13 3:24am

Anurag Sinha V

Updated 28-Sep-13 4:43am

v2

Comments

Sergey Alexandrovich Kryukov 28-Sep-13 10:40am

Up-voted with 4. It's better to use DateTime.Parse/ParseExact/TryParse/TryParseExact
Also, your statement "dt1 is lesser than dt2" is plain wrong. Correct one would be "less or equal".
Will you please fix it, as it is important?
—SA

Anurag Sinha V 28-Sep-13 10:46am

done

Sergey Alexandrovich Kryukov 28-Sep-13 11:13am

Great.
—SA

Sharathkumar k.r 30-Sep-13 7:52am

thank u.. that code worked.

Anurag Sinha V 30-Sep-13 7:55am

np

Sharathkumar k.r 3-Oct-13 6:07am

thank u its working.