how we compare textbox value with database value in vb.net

 
con.con_open()
 
        Dim cmdlogin As New SqlCommand(("SELECT * FROM users WHERE user_name='" & _
                                            txtuname.Text & "' and password='" & _
                                            txtpassword.Text & "'"), con.con)
        Dim dalogin As New SqlDataAdapter
        Dim dslogin As New Data.DataSet
        dalogin.SelectCommand = cmdlogin
        cmdlogin.ExecuteNonQuery()
        dslogin.Clear()
        dalogin.Fill(dslogin, "users")
 

        If dslogin.Tables(0).Rows.Count > 0 Then
 
        Else
            
        End If
 
'--------------------or

        if txtusername.text=dslogin.Tables(0).Rows(0).Item(0).ToString then
 
        else
 
        end if
 
'--------------------

        con.con_close(