How to check if txt file has data stored on button click

I am trying to check to make sure my program doesn't blow up when trying to retrieve data from a txt file.

I have two options on my address book screen.... Save and Get.
I want to show an error if they click get before there is anything saved in the text file.

I have the following for button clicks to save and retrieve the data.

    ' When clicking the save button on the form, the information will save to pim.txt.
    Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
        Using fp As New IO.StreamWriter("PIM.txt")
            fp.WriteLine(txtName.Text)
            fp.WriteLine(cboSuffix.SelectedItem)
            fp.WriteLine(cboMonth.SelectedItem)
            fp.WriteLine(cboDay.SelectedItem)
            fp.WriteLine(txtYear.Text)
            fp.WriteLine(txtAddress.Text)
            fp.WriteLine(txtCity.Text)
            fp.WriteLine(txtState.Text)
            fp.WriteLine(txtZip.Text)
            fp.WriteLine(MaskedtxtPhone.Text)
            fp.WriteLine(txtCompany.Text)
            fp.Close()
        End Using
    End Sub
    ' When clicking the get button on the form, the information saved in the pim.txt file will be loaded into the fields.
    Private Sub btnGet_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGet.Click
        Using fp As New IO.StreamReader("PIM.txt")
            txtName.Text = fp.ReadLine
            cboSuffix.SelectedItem = fp.ReadLine
            cboMonth.SelectedItem = fp.ReadLine
            cboDay.SelectedItem = fp.ReadLine
            txtYear.Text = fp.ReadLine
            txtAddress.Text = fp.ReadLine
            txtCity.Text = fp.ReadLine
            txtState.Text = fp.ReadLine
            txtZip.Text = fp.ReadLine
            MaskedtxtPhone.Text = fp.ReadLine
            txtCompany.Text = fp.ReadLine
            fp.Close()
        End Using
    End Sub