# Converting A Combobox Selection into a integer?

• ### Question

• I am working on a calculator program for a game and when someone selects say "Regular Log" from the combo box, how can i make that convert into an integer for a simple math equation.?
Thursday, December 18, 2008 10:13 PM

• demon824,

I see, ok, well you could use an Integer Array that has values of numbers you want to associate with the Index of your ComboBox, try this:

 Public Class Form1 Private cbInt(2) As Integer Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load cbInt(0) = 25 cbInt(1) = 50 End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged Me.Text = Math.Log(cbInt(ComboBox1.SelectedIndex)) End Sub End Class

This will change the Text in the Form's Text (Just for the example), according to what Index is selected by the user, which in turn associates the value with our predefined values of 25 and 50.

I hope this helps.

Best Regards,

Thursday, December 18, 2008 11:15 PM

### All replies

• demon824,

I am not sure how you mean convert the String, "Regular Log" into an Integer; do you mean find out the SelectedIndex of the item?  If so, just do something like this:

 MessageBox.Show(Math.Log(ComboBox1.SelectedIndex))

I am not sure what "simple math equation" you want to use, so I just used a Log.

I hope that helps, any questions feel free to post.

Best Regards,

Thursday, December 18, 2008 10:31 PM
• All right heres a better explanation. I want to have a collection of strings in a combobox (so far i did that) but, I want each of those combobox strings to be a certain number. (ex. the combobox choice is Regular, i want that to also equal the integer 25).. Is that better? Is this even possible?
Thursday, December 18, 2008 10:34 PM
• demon824,

I see, ok, well you could use an Integer Array that has values of numbers you want to associate with the Index of your ComboBox, try this:

 Public Class Form1 Private cbInt(2) As Integer Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load cbInt(0) = 25 cbInt(1) = 50 End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged Me.Text = Math.Log(cbInt(ComboBox1.SelectedIndex)) End Sub End Class

This will change the Text in the Form's Text (Just for the example), according to what Index is selected by the user, which in turn associates the value with our predefined values of 25 and 50.

I hope this helps.

Best Regards,