[jhedonghae]

is this right?
Dim timein1 As DateTime = CDate(TimeInTextBox.Text)
Dim timeout1 As DateTime = CDate(TimeOutTextBox.Text)

[jhedonghae]

or this one?
Dim SDate1 As DateTime = DateTime.Parse(TimeInTextBox.Text)
Dim SDate2 As DateTime = DateTime.Parse(TimeOutTextBox.Text)

[_HAWK_]

I would use DateTime.TryParse when getting info from textboxes.

[jhedonghae]

_HAWK_, on 11 October 2012 - 10:23 AM, said:

I would use DateTime.TryParse when getting info from textboxes.

Dim SDate1 As DateTime = DateTime.TryParse(TimeInTextBox.Text)
there is an error saying overload resolution failed because no accessible 'Try Parse' accepts this number of arguments

[CharlieMay]

It's asking for more arguments
But...

Tryparse returns a boolean true upon success, the parameters are what you are trying to parse and what variable do you want to use upon success.

Dim myDate as DateTime
If DateTime.TryParse("05/05/2012", myDate) Then
  'Parse Successful do something with the variable
End if

So upon success myDate which you defined to be datetime now holds an actual date of 5/5/2012

This post has been edited by CharlieMay: 11 October 2012 - 10:52 AM

[jhedonghae]

CharlieMay, on 11 October 2012 - 10:52 AM, said:

It's asking for more arguments
But...

Tryparse returns a boolean true upon success, the parameters are what you are trying to parse and what variable do you want to use upon success.

Dim myDate as DateTime
If DateTime.TryParse("05/05/2012", myDate) Then
  'Parse Successful do something with the variable
End if

So upon success myDate which you defined to be datetime now holds an actual date of 5/5/2012

but i don't want to assign a fixed date... what happens to the textbox?

i also tried this but i didn't get the right result

Dim SDate1 As DateTime = DateTime.Parse(TimeInTextBox.Text)
        Dim SDate2 As DateTime = DateTime.Parse(TimeOutTextBox.Text)
        TotalOTTextBox.Text = Val(SDate1) - Val(SDate2)
        TotalHWTextBox.Text = Val(SDate1) + Val(SDate2)

This post has been edited by AdamSpeight2008: 11 October 2012 - 11:39 AM

[lucky3]

Instead of fixed date from example of CharlieMay, use .Text property of your TextBox.

[AdamSpeight2008]

jhedonghae, on 11 October 2012 - 07:03 PM, said:

Dim SDate1 As DateTime = DateTime.Parse(TimeInTextBox.Text)
        Dim SDate2 As DateTime = DateTime.Parse(TimeOutTextBox.Text)
        TotalOTTextBox.Text = Val(SDate1) - Val(SDate2)
        TotalHWTextBox.Text = Val(SDate1) + Val(SDate2)

Why are using Val(SDate1) ? I is a date, and it has a - operator defined, to do the difference.

I think you should go back and learn the basics, and syntax. What a function is? What a type is? What an Object is? Controls and GUI are an advanced for a beginner, start with Console applications. As it focuses you on the design of the algorithm since there no controls.