ASP.NET

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Hello;
 
I'm working on a simple login form in c# in asp.net. I'd like to bind a key to the password and then save it in encrypted form. When the user logs in, he should enter his key and password. The key will be bind to the password and then compared to the one stored on the database.
 
Please help me with the binding process and encryption.
Thanks.

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
 
        If Not IsPostBack Then
            ddlParks.AppendDataBoundItems = True
            Dim strQuery As [String] = "Select parkID, parkName from ParksCategory"
            Dim con As New SqlConnection(strConnString)
            Dim cmd As New SqlCommand()
            cmd.CommandType = CommandType.Text
            cmd.CommandText = strQuery
            cmd.Connection = con
            Try
                con.Open()
                ddlParks.DataSource = cmd.ExecuteReader()
                ddlParks.DataTextField = "parkName"
                ddlParks.DataValueField = "parkID"
                ddlParks.DataBind()
            Catch ex As Exception
                Throw ex
            Finally
                con.Close()
                con.Dispose()
            End Try
        End If
    End Sub
    Protected Sub ddlParks_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles ddlParks.SelectedIndexChanged
 
        Dim strQuery As [String] = "select subcatID, subcatName from SubCategory" _
                                    & "where parkID=@parkID AND Status=1"
        Dim con As New SqlConnection(strConnString)
        Dim cmd As New SqlCommand()
        cmd.Parameters.AddWithValue("@parkID", _
                             ddlParks.SelectedItem.Value)
        cmd.CommandType = CommandType.Text
        cmd.CommandText = strQuery
        cmd.Connection = con
        Try
            con.Open()
 
            dr = cmd.ExecuteReader()
 
            Do While dr.HasRows
                lblfacility.Text = dr.GetName(1)
 
                Do While dr.Read()
 
                      lblfacility.Text = dr.GetString(1)
                Loop
 
                dr.NextResult()
            Loop
 
        Catch ex As Exception
            Throw ex
        Finally
            con.Close()
            con.Dispose()
        End Try
    End Sub

          string calidd = "select calid from calib where Tulname Like @myse";
                cmd2 = new SqlCommand(calidd, con);
                cmd2.Parameters.AddWithValue("@myse", se);
                DateTime dt;
                dar2 = cmd2.ExecuteReader();
                while (dar2.Read())
                {
                    dt = Convert.ToDateTime((dar[0].ToString()));
                    xxcd = dt.ToString("dd/MM/yyyy");
                }
                
                calibdlab.Text = xxcd;