Share variables between excel and visual basic - vba

Question

I recently started programming with .NET visual basic using visual basic studio. I am also using excel VBA to make some macros. I would be very appreciative if someone could answer a question I have, apologies if the answer is obvious, I'm just getting started:
Basically, if I have set a variable in excel VBA, for example:
dim text as string
text = "hello world"
Would it be possible for me to use that variable when programming in visual basic and have it retain its value from when it was set in the excel VBA macro.
Please comment if you need clarification.
Many thanks.
SOLUTION:
Okay I managed to figure it out with the help of the solutions, the code that works in VB is as follows:
Imports Microsoft.Office.Interop.Excel
Imports Microsoft.Office.Interop
Imports Microsoft.Office.Core
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim oxl As excel.application
Dim owb As excel.workbook
Dim osheet As Excel.worksheet
Dim orng As excel.Range
Dim strtext As String
oxl = CreateObject("Excel.application")
owb = oxl.Workbooks.Open(Filename:="C:\Users\USERNAME\Documents\Variable Passing Test.xlsm")
oxl.Run("dosomethingtostrtext")
strtext = oxl.Run("getstrtext")
MsgBox(strtext)
End Sub
End Class

Answer 1

One way to access variables in another workbook's VBA code is to create functions that return those values to you. Then call those functions from your other app.
For example, let this be code in a module in your Excel file with the macro:
Option Explicit
Private strText As String
' Say you have a routine that manipulates strText (or not, even!)
Public Sub doSomethingToSTRTEXT()
strText = "Hello World!"
End Sub
' This is the function to call to retrieve strText
Public Function getSTRTEXT() As String
getSTRTEXT = strText
End Function
And this is code in a VBA project elsewhere (not running .Net on this machine, just microsoft office sad) where you have this:
Option Explicit
Sub Test()
' Declare
Dim WBK As Workbook
' Open the workbook in question
Set WBK = Workbooks.Open(Filename:="C:\Path\To\File\With\VBA.xls")
' This code's own variable
Dim strText As String
' Call the routine (or not) that does something to that workbook's vba's strText
Application.Run (WBK.Name & "!doSomethingToSTRTEXT")
' Now let's retrieve that value via function!
strText = Application.Run(WBK.Name & "!getSTRTEXT")
' Show it to me
MsgBox strText
End Sub
I would like to leave the conversion of the code right above ^ into VB.Net to you (or do a search here on SO for .Net code to handle Excel objects) and try it out