VB.NET MySQL Login using MD5 + Salt

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VB

Imports System.Security.Cryptography
Imports MySql.Data.MySqlClient
Public Class LoginForm1

    Private Sub Cancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Cancel.Click
        Me.Close()
    End Sub
        Dim MySqlConnection As MySqlConnection
        Private Function StringtoMD5(ByVal Content As String) As String
        Dim M5 As New System.Security.Cryptography.MD5CryptoServiceProvider
            Dim ByteString() As Byte = System.Text.Encoding.ASCII.GetBytes(Content)
        ByteString = M5.ComputeHash(ByteString)
            Dim FinalString As String = Nothing
            For Each bt As Byte In ByteString
            FinalString &= bt.ToString("x2")
            Next
            Return FinalString
        End Function
        Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click
            PasswordTextBox.Text = StringtoMD5(PasswordTextBox.Text)
            MySqlConnection = New MySqlConnection
        MySqlConnection.ConnectionString = "Server=****;Database=****;Uid=****;Pwd=****;"
            MySqlConnection.Open()

            Dim Myadapter As New MySqlDataAdapter
        Dim sqlquary = "SELECT * FROM table_name WHERE username='" & UsernameTextBox.Text & "'AND password='" & PasswordTextBox.Text & "';"

            Dim command As New MySqlCommand
            command.Connection = MySqlConnection
            command.CommandText = sqlquary
            Myadapter.SelectCommand = command
            Dim mydata As MySqlDataReader
            mydata = command.ExecuteReader
            If mydata.HasRows = 0 Then
                MsgBox("Sorry! We can't find your Username and Password. Try Again or contact us on the forum")
            Else
                Form1.Show()
                Me.Close()

            End If
    End Sub
End Class

I'm trying to make a login application that connects to my website database and try's logging in through the database by grabbing the username and password from the table. It connects to the database and finds the username but it does not like the password for it because it uses MD5 and Salt. Does anyone know how to get this working and get the hash value right?

Salt = "7UEJD7xQ"
MD5 = "923c5abb8c5cdf0cf3e60c02716f3763"
Password = "iBD1Ux6V"

Help would be appreciated thanks!