empty path name is not legal

[baastina]

 Try
            Dim cn As New SqlConnection("Data Source=MSR\LOCAL;Initial Catalog=Eventena;Integrated Security=True")
            cn.Open()
            Using cmd As New SqlClient.SqlCommand("INSERT into BirthdayRegistration where Name='" & TextBox4.Text & "',LastName='" & TextBox2.Text & "',Email='" & TextBox5.Text & "',StreetNo='" & TextBox6.Text & "',Main='" & TextBox7.Text & "',Area='" & TextBox8.Text & "',City='" & ComboBox1.Text & "',State='" & ComboBox2.Text & "',BirthdayName='" & TextBox1.Text & "',BirthdayDate='" & DateTimePicker1.Text & "',Time='" & TextBox3.Text & "',Food='" & ComboBox3.Text & "',Guest='" & TextBox9.Text & "',Cost='" & Label19.Text & "',BirthdayVP=@BirthdayVP", cn)
                cmd.Parameters.Add(New SqlClient.SqlParameter("@BirthdayVP", SqlDbType.Image)).Value = IO.File.ReadAllBytes(a.FileName)
                i = cmd.ExecuteNonQuery
            End Using
            If (i > 0) Then
                MsgBox("Inserted" & i & "record successfully", MsgBoxStyle.Information)
                BirthdayPaymentMode.Show()
                clear()
            End If
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
        cn.Close()

I'm displaying the image and the cost from 1st table in data grid.

I'm displaying in label data is cost and the image in picture box.

This image of picture box and the cost of label should have to store in 2nd table.. while doing this it shows empty path name is not legal.

[Frinavale]

What is the variable a?
It is not declared in the above posted code.