MySQL VB.NET Tutorial 2 : Create Login Form with MySql and VB.NET (Part 1)

Imports MySql.Data.MySqlClient

Public Class Form1
    Dim MysqlConn As MySqlConnection
    Dim COMMAND As MySqlCommand




    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        MysqlConn = New MySqlConnection
        MysqlConn.ConnectionString =
       "server=localhost;userid=root;password=root;database=database"

        Try
            MysqlConn.Open()
            MessageBox.Show("Connection Successful")
            MysqlConn.Close()

        Catch ex As MySqlException
            MessageBox.Show(ex.Message)
        Finally
            MysqlConn.Dispose()

        End Try

    End Sub

    Private Sub Login_Btn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Login_Btn.Click
        MysqlConn = New MySqlConnection
        MysqlConn.ConnectionString =
       "server=localhost;userid=root;password=root;database=database"
        Dim READER As MySqlDataReader


        Try
            MysqlConn.Open()
            Dim Query As String
            Query = "select * from database.edata where user_name='" & TextBox_UN.Text & "' and password='" & TextBox_Pass.Text & "' "
            COMMAND = New MySqlCommand(Query, MysqlConn)
            READER = COMMAND.ExecuteReader
            Dim count As Integer
            count = 0
            While READER.Read
                count = count + 1

            End While

            If count = 1 Then
                MessageBox.Show("Username and password are correct")
            ElseIf count > 1 Then
                MessageBox.Show("Username and password are Duplicate")
            Else
                MessageBox.Show("Username and password are not correct")

            End If


            MysqlConn.Close()

        Catch ex As MySqlException
            MessageBox.Show(ex.Message)
        Finally
            MysqlConn.Dispose()

        End Try
    End Sub
End Class

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