How I Store Pdf File In Mysql_Database And Retrive Using Vb.Net

'Add A Sql Column With Data Type varbinary
Dim fd As OpenFileDialog = New OpenFileDialog()
'fd.Filter = "pdf file|*.pdf"
If fd.ShowDialog = Windows.Forms.DialogResult.OK Then
    'Interaction.MsgBox("File saved into database", MsgBoxStyle.Information)
End If
sqlStr = ""
sqlStr = ""


Dim fs As New FileStream(fd.FileName, FileMode.Open, FileAccess.Read)

Dim br As New BinaryReader(fs)

Dim bytes As Byte()

bytes = System.IO.File.ReadAllBytes(fd.FileName)

'insert the file into database

strConn = New SqlConnection(oCommon.DSN())
strConn.Open()

sqlStr = ""
sqlStr = "update YourTable set Columns = @Columns WHERE Column =      '" & detgrd(detgrd.Row, 0).ToString().ToUpper().Trim() & "' "
SqlCmd = New SqlCommand
SqlCmd.CommandText = sqlStr
SqlCmd.Parameters.Add("@Columns ", SqlDbType.Binary).Value = bytes
SqlCmd.Connection = strConn
SqlCmd.ExecuteNonQuery()
MessageBox.Show("SuccessFull", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information)

Dim filePdf As String
           filePdf = Application.StartupPath & "\" & fileNmaeYouWant & ".pdf"
           If System.IO.File.Exists(filePdf) Then
               File.Delete(filePdf)
           End If
           Dim bytesLoad As Byte()
           bytesLoad = Nothing
           sqlStr = ""
           sqlStr = "select pdfColumn from yourtable where  "' "
           mydatatable = New DataTable
           mydatatable = modFunctions.ReturnData(sqlStr)
           If mydatatable.Rows.Count > 0 Then
               If IsDBNull(mydatatable.Rows(0).Item("pdfColumn")) = True Then
                   Exit Sub
               Else
                   bytesLoad = mydatatable.Rows(0).Item("pdfColumn")
               End If
           Else
               Exit Sub
           End If
           My.Computer.FileSystem.WriteAllBytes(filePdf, bytesLoad, False)
           System.Diagnostics.Process.Start(filePdf)