在vb.net中将变量从一个表单传递到另一个表单

我有两个公共类,每个表单一个.

第一个表单有一个文本框和两个按钮：

Public Class frmAdd
    Public addvar As String
    Public Sub UltraButton1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs)  Handles btnAddNote.Click

        If txtAdd.Text = String.Empty Then
            MsgBox("Please complete the notes textbox!")
        Else
            addvar = txtAdd.Text
            MsgBox(addvar)
            Close()
        End If
    End Sub

    Public Sub UltraButton2_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles btnCancel.Click
        Me.Close()
    End Sub
End Class

在第二种形式中,我想采用addvar变量并说出来

Public Sub saveButton_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles addButton.Click

frmAdd.show()

me.textbox1.text = addvar

如何在vb.net中使用它？