How to check the data type of a variable

Is it possible to check and see what data type a variable is in a conditional statement?

Ex:
Dim x as Integer = 1

If x Is Integer Then
MessageBox.Show("Int")
Else
MessageBox.Show("Other")
End IF

Thanks,
-Patrick

Found my own Answer. Thank you

Ans: If TypeName(x) = "Integer"

Actually this brought up another problem.

I guess what I am looking for is a function that will let me know if I can cast, a passed, string variable into an integer.

I have a function that takes either a, b, c or a number from 1-10. I am trying to write some validation code that will make sure it meets those criteria. If the passed string is either a-c or 1-0 I would like to change the varialbe type of a, b, or c to 11, 12 or 13.

Any Ideas?

Like this :

VB Code:

Dim i As Integer
Dim t As Type =I.GetType
MessageBox.Show(t.Tostring)

You might do something like this :

VB Code:

Select Case (t.ToString) 
 
Case "Integer" 
'do this 
 
Case "String" 
'do this

The problem I am having is that all the values come in as a string because I am doing these operations in a Function.

Code:

---

Public Function Validate(ByVal Number As String)
Dim TmpCard as Integer

'The purpose of this function is to take in text from a textbox that represents a playing card and checks to make sure its either 1-13 or a, j, q, or k

            Select Case UCase(Number)
                Case "A"
                    TmpCard = 1
                Case "J"
                    TmpCard = 11
                Case "Q"
                    TmpCard = 12
                Case "K"
                    TmpCard = 13
                Case Else
                    TmpCard = Number  **Errors When I pass in 'ggg' (cannot convert type string to integer)**
            End Select

        If TmpCard > 0 And TmpCard < 14 Then
            Return TmpCard
        Else
            MessageBox.Show("Enter Card number 1-13 or a, j, q, k")
        End If

End Function

---

Maybe this clarifies what I am trying to do.

Thanks

The problem I am having is that all the values come in as a string because I am doing these operations in a Function.

Code:

---

Public Function Validate(ByVal Number As String)
Dim TmpCard as Integer

            Select Case UCase(Number)
                Case "A"
                    TmpCard = 1
                Case "J"
                    TmpCard = 11
                Case "Q"
                    TmpCard = 12
                Case "K"
                    TmpCard = 13
                Case Else
                    TmpCard = Number  **Errors When I pass in 'ggg' (cannot convert type string to integer)**
            End Select

        If TmpCard > 0 And TmpCard < 14 Then
            Return TmpCard
        Else
            MessageBox.Show("Enter Card number 1-13 or a, j, q, k")
        End If

End Function

---

Maybe this clarifies what I am trying to do.

Thanks

Do you mean , you want to check if the passed string is Integer or String type ? or what ?:confused:

Quote:

---

Originally posted by SoonerToucan
The problem I am having is that all the values come in as a string because I am doing these operations in a Function.

Code:

---

Public Function Validate(ByVal Number As String)
Dim TmpCard as Integer

'The purpose of this function is to take in text from a textbox that represents a playing card and checks to make sure its either 1-13 or a, j, q, or k

            Select Case UCase(Number)
                Case "A"
                    TmpCard = 1
                Case "J"
                    TmpCard = 11
                Case "Q"
                    TmpCard = 12
                Case "K"
                    TmpCard = 13
                Case Else
                    TmpCard = Number  **Errors When I pass in 'ggg' (cannot convert type string to integer)**
            End Select

        If TmpCard > 0 And TmpCard < 14 Then
            Return TmpCard
        Else
            MessageBox.Show("Enter Card number 1-13 or a, j, q, k")
        End If

End Function

---

Maybe this clarifies what I am trying to do.

Thanks

---

May be I am misunderstanding you but TmpCard only exists within the Function. You should be using "Return". Also, it is dangerous to use a VB.NET keyword as the name of a function. Try:

In the calling event, assuming the card value comes from TextBox1:

Dim TmpCard as Integer
TmpCard=val(CardValidate(Textbox1.Text))
If TmpCard<1 or TmpCard>13 Then
MessageBox.Show("Invalid Card Entry)
End If


Public Function CardValidate(ByVal Number As String)
Select Case UCase(Number)
Case "A"
Return "1"
Case "J"
Return "11"
Case "Q"
Return "12
Case "K"
Return "13"
Case Else
Return Number
End Select

End Function

In a sense yes. In non programming terms I want the user to input some text in a textbox that is supposed to represent a value of a playing card. Once they have entered the value I would like to check it to make sure it is either a number from 1 to 13 or the letters A, J, Q or K.

The function works fine until someone types in jibberish like 'ggg9'

I hope that clairifies it some.

Thanks,
-Patrick

Hi,

Sorry I was a bit slow in posting my response just now. I was trying it out in the middle of posting.

I'm not at my dev computer now . If you got no more help , I'll make you a demo .

Thanks to your help it works now.

-Patrick

Quote:

---

Originally posted by SoonerToucan
Thanks to your help it works now.

-Patrick

---

Which did you use?

I used the code you posted Taxes, it worked great.

Thanks again to everyone for all the help

-Patrick