Updating BLOB Image from a MySQL DB in Visual Studio 2013

I have an Add Form where I can add records to my db with 3 fields (Last Name, First Name and a Picture).

There is no error whatsoever but now I'm stuck on how to EDIT/UPDATE each record's IMAGE.

I can update the First Name and Last Name but I don't how to update the Image. Can someone be nice enough to lead me on the right direction? Perhaps the syntax on my UPDATE table SET field.

Here's my Add Form:

           

Dim sConnection As MySqlConnection = New MySqlConnection("SERVER = localhost; USERID = root; PASSWORD = loadedro; DATABASE = adbms_test_db;")        Dim sCommand As MySqlCommand        Dim fStream As FileStream        Dim bReader As BinaryReader        Try            If txt_last_name.Text.Length > 0 And txt_image.Text.Length > 0 Then                Dim FileName As String = txt_image.Text                Dim ImageData() As Byte                fStream = New FileStream(FileName, FileMode.Open, FileAccess.Read)                bReader = New BinaryReader(fStream)                ImageData = bReader.ReadBytes(CType(fStream.Length, Integer))                bReader.Close()                fStream.Close()                Dim CmdString As String = "INSERT INTO tbl_adbms_test(LastName, FirstName, Picture) VALUES(@LastName, @FirstName, @Picture)"                sCommand = New MySqlCommand(CmdString, sConnection)                sCommand.Parameters.Add("@LastName", MySqlDbType.VarChar, 45)                sCommand.Parameters.Add("@FirstName", MySqlDbType.VarChar, 45)                sCommand.Parameters.Add("@Picture", MySqlDbType.Blob)                sCommand.Parameters("@LastName").Value = txt_last_name.Text                sCommand.Parameters("@FirstName").Value = txt_first_name.Text                sCommand.Parameters("@Picture").Value = ImageData                sConnection.Open()                Dim RowsAffected As Integer = sCommand.ExecuteNonQuery()                If (RowsAffected > 0) Then                    MsgBox("The record was saved.", MsgBoxStyle.Information)                    pic_box_stud.Image = Nothing                    txt_image.Text = ""                    txt_last_name.Text = ""                    txt_first_name.Text = ""                End If                sConnection.Close()            Else                MsgBox("Incomplete data!", MsgBoxStyle.Critical, "")            End If        Catch ex As Exception            MsgBox(ex.ToString())        Finally            If sConnection.State = ConnectionState.Open Then                sConnection.Close()            End If        End Try        frm_main.LoadPeople()        Close()

And here's my current Edit Form (without the Picture update)

           

 If sConnection.State = ConnectionState.Closed Then            sConnection.ConnectionString = "SERVER = localhost; USERID = root; PASSWORD = loadedro; DATABASE = adbms_test_db"            sConnection.Open()        End If        Dim sqlQuery As String = "UPDATE tbl_adbms_test SET LastName='" & txt_last_name.Text & "', FirstName='" & txt_first_name.Text & "' WHERE IDNo='" & IDNo & "'"        Dim sqlCommand As New MySqlCommand        With sqlCommand            .CommandText = sqlQuery            .Connection = sConnection            .ExecuteNonQuery()        End With        MsgBox("Record updated successfully.", MsgBoxStyle.Information)        Dispose()        Close()        frm_main.LoadPeople()

I tried adding the Picture on the UPDATE syntax but it won't accept it since Picture is not a string. What syntax should I use to update it? Any help would be greatly appreciated. :D