[RESOLVED] PROBLEM WITH COMBOBOX..important

Hi everyone,

I'm a newbee with vbnet ,I have a vb net 2005 and I write for pocketpc application ,
I have 1 combobox and 5 values in it ,when I select 1 value from the cmbo it writes values in textboxes , what wrong with this code that it returns values only from case 1-4 ,and ignores the values of case 0?!

please its very important..

Code:

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        If ComboBox1.SelectedItem() Then
            Dim ans As Double
            ans = ComboBox1.SelectedItem
            Select Case ans
                Case -1
                    MessageBox.Show("יש לבחור את דרגת החספוס")
                Case 0
                    TextBox3.Text = 0.153
                    TextBox4.Text = 0.003
                    TextBox5.Text = 1.0
                Case 1
                    TextBox3.Text = 0.17
                    TextBox4.Text = 0.01
                    TextBox5.Text = 1.0
                Case 2
                    TextBox3.Text = 0.19
                    TextBox4.Text = 0.05
                    TextBox5.Text = 2.0
                Case 3
                    TextBox3.Text = 0.215
                    TextBox4.Text = 0.3
                    TextBox5.Text = 5.0
                Case 4
                    TextBox3.Text = 0.234
                    TextBox4.Text = 1.0
                    TextBox5.Text = 10.0

            End Select
        End If

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Firstly and most importantly, yay for Tux :P

Now to your question, the problem with your code was the way in which you checked to see if there was a selected item. When the SelectedItem was 0 the If statement was If 0 Then, and 0 is used to represent False in binary, which is why it wasn't working for 0.
The following code would work;

Code:

---

        If ComboBox1.SelectedItem IsNot Nothing Then
            Dim ans As Double
            ans = ComboBox1.SelectedItem
            Select Case ans
                Case -1
                    MessageBox.Show("יש לבחור את דרגת החספוס")
                Case 0
                    TextBox3.Text = 0.153
                    TextBox4.Text = 0.003
                    TextBox5.Text = 1.0
                Case 1
                    TextBox3.Text = 0.17
                    TextBox4.Text = 0.01
                    TextBox5.Text = 1.0
                Case 2
                    TextBox3.Text = 0.19
                    TextBox4.Text = 0.05
                    TextBox5.Text = 2.0
                Case 3
                    TextBox3.Text = 0.215
                    TextBox4.Text = 0.3
                    TextBox5.Text = 5.0
                Case 4
                    TextBox3.Text = 0.234
                    TextBox4.Text = 1.0
                    TextBox5.Text = 10.0

            End Select
        End If

---

Anyway I hope this helps

Satal :D

Hi Satar,

Thank you very much for quick reply , it works but another thing , if I want to combine a condition -
that if textbox1.text>200 then write message "it can't be design" how should I do it.

Satar, that's a new one :p

Code:

---

If IsNumeric(TextBox1.Text) Then
    If TextBox1.Text > 200 Then
        MessageBox.Show("It can't be designed")
    End If
End If

---

Satal

Quote:

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Originally Posted by noam309

Hi Satar,

Thank you very much for quick reply , it works but another thing , if I want to combine a condition -
that if textbox1.text>200 then write message "it can't be design" how should I do it.

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These are very basic questions - I hope you are not going to post a new thread labelled URGENT or VERY IMPORTANT every time you have a question that you would know the answer to if you followed a simple VB.NET beginners tutorial...

Thank you very much , it works fine .

chris128 , I mensioned already that I am a newbee , and I know it is a simple question for you but believe me I tried to figure it out by myself before I asked , and there are some things that are very urgent , so I'm sorry if the words "urgent" bother you but it is only 2 posts.

Isn't this forum supposed to help people no matter if they have an easy questions or not ?! or maybe this forum should be called - for advanced only.

thank you , and I hope for more Patience.

believe me I'm an engineer and architect and have to give answers for a lot of questions that I find silly.

Noam.

The word urgent on a free public forum does bother me yes, because it implies that you think your question should be answered before other people's - so tell me, why was it so urgent and important?

Also, its not that I think people should only ask advanced questions, it is just that asking how to use a basic IF statement is something you learn from any beginners tutorial out there - so I assume you have not followed such a tutorial and will therefore be asking more basic questions like this. Dont you think it would be worth doing one of these tutorials, for your benefit (you wont have to wait for people to answer your questions) and for our benefit (we wont have to repeat what is already readily available in hundreds of tutorials on the web) ? If you are an engineer and an architect then surely you appreciate the importance of understanding the basics before you start trying to do something.