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Imports System.Data.Sql
Imports System.Data.SqlClient

Module code_ประกาศฟังกชัน_

    'ฐานข้อมูล
    Friend cn As New SqlConnection("Data Source=.; Initial Catalog=pro_consumeble; Integrated Security=SSPI;")

    'cmd sqlcommand
    Friend cmd As New SqlCommand
    'DA sqldataadapter
    Friend DA As New SqlDataAdapter
    'SQL  = เป็นคำสั่ง
    Friend sql As String
    'SQL DATA SET
    Friend DS As DataSet

    Friend DR As SqlDataReader

    'ฟังก์ชันเปิดฐานข้อมูล
    Friend Sub connect_open()
        Try
            If cn.State = ConnectionState.Closed Then cn.Open()

        Catch ex As Exception

        End Try
        End Sub
End Module
    
    

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 Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        sql = "SELECT cus_id, cus_fullname, cus_dept, cus_date, cus_status FROM customer WHERE cus_id ='" & ComboBox1.Text & "'"
        cmd = New SqlCommand(sql, cn)
        Call connect_open()
        DR = cmd.ExecuteReader()
        DR.Read()
        Text_fullname_export.Text = DR.Item("cus_fullname")


    End Sub

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Private Sub Combobox1_SelectIndex (sender As Object, e As EventArgs) Handles Combobox1.SelectIndexChanged

Dim ID As Integer

ID = Combobox1.SelectItem

End SuB

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 Command = ("SELECT * FROM Customer Where " & ID)

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Public dt As DataTable = New DataTable

Dim myCom As String = "SELECT * FROM user_app WHERE username='" & txtUser.Text & "' and password='" & txtPass.Text & "';"

            SqlCom = New MySqlCommand(myCom, SqlConnection)

            Dim Reader As MySqlDataReader = SqlCom.ExecuteReader


            If Reader.HasRows Then

                SqlConnection.Close()

                SqlConnection.Open()

                Dim da As MySqlDataAdapter = New MySqlDataAdapter(myCom, SqlConnection)
                da.Fill(dt)

                For Each row As DataRow In dt.Rows
                    Fname = row("fname")
                    Sname = row("sname")
                    status = row("status")
                    If status = False Then
                        Branch = row("branch")
                    End If

                Next

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For Each row As DataRow in dt.Rows
		Textbox1.Text = row("xxxxx") '<<<< ใน xxx คือชื่อของคอลัมน์ที่คุณตั้งใน Database นะครับ
		Next