How to calculated due date betwen two date in ASP.NET web form

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Hi Guys,,, I'm try to calculated due date betwen two date but I'm can't solve this trouble. I'm found the refrence code in VB and then I'm try to translate that code to C#. Anny help could be appriciate.

What I have tried:

this isi code to calculated due date betwen two date in VB.NET

BASIC

'find maturities based on installments to ??? 
DueDate.Text = DateAdd(DateInterval.Month, Val(InstallmentsTo.Text), DateValue(RentDate.Text))

and then I'm try translate that code in C#. But this code not working

ASP.NET

<pre lang="ASP.NET">

//find maturities based on installments to ???
private void SearchDueDate()
{
System.DateTime PaymentDate;
System.DateTime RentDate;

int InstallmentsTo;
InstallmentsTo = Convert.ToInt32(txtcicilan_ke.Text);

RentDate = Convert.ToDateTime(txttgl_pinjaman.Text);
PaymentDate = Convert.ToDateTime(txttanggal_pembayaran.Text);

DueDate.Text = Convert.ToDateTime(PaymentDate - RentDate), InstallmentsTo.ToString("yyyy/MM/dd");
}

Posted 6-Jun-21 20:23pm

tri setia

Updated 12-Jun-21 19:58pm

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OriginalGriff · Answer 1 · 2021-06-06T20:42:00

First off, don;t use Val in VB, or Convert in C# to convert user input - particularly date based.
Instead use the various TryParse / TryParseExact methods and report errors to the user instead of continuing. Better still, use a calendar control for data input instead of a textbox, so the user can't enter an invalid date and access the DateTime value directly.

C#

DateTime dt;
if (!DateTime.TryParse(myTextBox.Text, out dt))
    {
    ... report problem to user ...
    return;
    }

Do the same thing for your Installments using int.TryParse, and then it's trivial:

C#

DateTime dueDate = dt.AddMonths(installments);

When you subtract two dates, you get a TimeSpan - you can't convert that to a date at all because it's just a "Number of ticks" between two points - it's like measuring two random points on a plane and subtracting them:
X = (2, 4), Y = (16, 3) - you get the distance between them as D = 14.03567 but that doesn't relate to the X or Y axes! Unless you pick a third point Z to base your "distance from" on, you can't draw it - and even then, you have an infinites number of points on a circle to chose from because distance doesn;t include any direction info!

Same this with DateA - DateB: you get a "number of days, hours, minutes" between them, but it's meaningless without a "new start point".