I have something similar to this:
In the result I get a concatenation of numbers instead of the sum
B4X:
Sub Class_Globals
Dim BANano As BANano 'ignore
Private txtNumber1 As SKTextBox 'ignore
Private txtNumber2 As SKTextBox 'ignore
Private txtNumberResult As SKTextBox 'ignore
End Sub
Sub Calculate
Dim Number1 As Double = txtNumber1.Text
Dim Number2 As Double = txtNumber2.Text
Dim NumberResult as Double
NumberResult = Number1 + Number2
txtNumberResult.Text = NumberResult
End Sub
In the result I get a concatenation of numbers instead of the sum