IsNumeric for textbox number in under each other vba

[kar2rost]

I want to enter the numbers under each other in textbox1
Create a code for me so that I can enter only the value of the number in this text box
and do not enter letters
There is no problem with one number, but it becomes a problem if the numbers are entered below each other

If Not IsNumeric(TextBox1) Then
        MsgBox (" just number"), vbOKOnly + vbMsgBoxRigh
    
        Exit Sub

    Else

 resume code......