Introduction: In this
article I will explain how to use the Ajax rating control in asp.net with
database.
Description:
We
see an option for rating on shopping website like FlipKart, SnapDeal, and
Amazon etc… There is a rating control using this we can display the rating. In
this example I have an Hotel and users will rate it. To implement the
functionality follow the below given steps:
Steps 1: Add the
Ajax toolkit to Visual Studio if not added. How to add the
Steps 2: Add a
webform to project/website. Now drag and drop the Rating Control from Toolbax
and design the page as given below:
HTML
markup of aspx page:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="pnlRating" runat="server">
<ContentTemplate>
<table width="100%">
<thead><tr><td align="center"><b>Hotel Name</b></td><td align="center"><b>Description</b></td><td ><b>Rating</p></td></tr></thead>
<tr>
<td align="center">Taj<img src="images/hotelimg.jpg"
/></td>
<td align="center"><p style="text-align:justify">Enjoy a one-of-a-kind experience:
the best service and facilities on Lanzarote
Unspoiled
beaches, dream swimming pools and unique tropical gardens
Privileged
climate all year round in one of Spain’s best resorts
Fine dining at
the hotel on international, Mediterranean and signature specialties
Discover our
service The Level, Meliá’s most exclusive commitment to luxury
Discover the
exclusive private Villas unique on Lanzarote
Hotel designed
by Fernando Higueras, Pritzker International Architecture Prize
Enjoy the new
Beach Bar by the sea (opening times vary by season)
The hotel is
part of Lanzarote’s Artistic and Cultural Heritage</p></td>
<td style="width:35%">
<asp:Rating ID="Rating1" runat="server" AutoPostBack="true" MaxRating="5" OnChanged="InsertRating" StarCssClass="ratingEmpty" WaitingStarCssClass="ratingSaved" EmptyStarCssClass="ratingEmpty" FilledStarCssClass="ratingFilled">
</asp:Rating>
<b> <asp:label ID="lblmessage"
runat="server"/>
</b>
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
In
his example maximum rating value is 5 but we can change the maximum rating
value using MaxRating property.
Note:
Don’t forget to add the Scriptmanager. Rating control requires ScriptManager on
page.
Step 3: Add the
given style in head section of page:
<style type="text/css">
table tr td {
padding:0 10px;
}
.ratingEmpty
{
background-image: url(images/ratingempty.png);
width:18px;
height:17px;
}
.ratingFilled
{
background-image: url(images/ratingfilled.png);
width:18px;
height:17px;
}
.ratingSaved
{
background-image:
url(images/ratingsaved.png);
width:18px;
height:17px;
}
</style>
Steps 4: Create a table
Tb_Rating:
Create table
Tb_Rating
(
HotelID int identity
not null,
Rating int
)
Not
create 2 store procedures to Insert and fetch the detail from database.
Store
Procedure to insert the detail to table:
CREATE PROCEDURE
InsertRating
(
@rating int
)
AS
BEGIN
SET
NOCOUNT ON;
Insert
into dbo.Tb_Rating
values (@rating)
END
Store
procedure to fetch the records from table:
CREATE PROCEDURE
GetRating
As begin
Select ISNULL(AVG(Rating),0) as rating,count(*) as Totalcount from dbo.Tb_Rating
End
Steps 5: Write the
below given code.
Add the Namespace:-
C#:
using
System.Data;
using
System.Data.SqlClient;
using
System.Configuration;
VB:
Imports
System.Data
Imports
System.Data.SqlClient
Imports
System.Configuration
Connection:-
C#:
SqlConnection
con = new SqlConnection(ConfigurationManager.ConnectionStrings["connection"].ToString());
VB:
Private
con As New SqlConnection(ConfigurationManager.ConnectionStrings("connection").ToString())
Write
the on OnChanged event of Rating
control to insert and save to the database:
C#:
protected void InsertRating(object
sender, AjaxControlToolkit.RatingEventArgs
e)
{
try
{
con.Open();
SqlCommand
cmd = new SqlCommand("InsertRating", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@rating", Rating1.CurrentRating);
cmd.ExecuteNonQuery();
con.Close();
BindRating();
}
catch (Exception ex)
{
}
}
VB:
Protected Sub InsertRating(sender As
Object, e As
AjaxControlToolkit.RatingEventArgs)
Try
con.Open()
Dim
cmd As New SqlCommand("InsertRating",
con)
cmd.CommandType = CommandType.StoredProcedure
cmd.Parameters.AddWithValue("@rating", Rating1.CurrentRating)
cmd.ExecuteNonQuery()
con.Close()
BindRating()
Catch
ex As Exception
End Try
End Sub
Code
to Bind/display the Rating:
C#:
protected void Page_Load(object
sender, EventArgs e)
{
if
(!IsPostBack)
{
BindRating();
}
}
protected void BindRating()
{
try
{
SqlDataAdapter
adp = new SqlDataAdapter("GetRating", con);
adp.SelectCommand.CommandType = CommandType.StoredProcedure;
DataTable
dt = new DataTable();
adp.Fill(dt);
if
(dt.Rows.Count > 0)
{
Rating1.CurrentRating = Convert.ToInt32(dt.Rows[0]["rating"]);
lblmessage.Text = dt.Rows[0]["Totalcount"] + "user(s)
have rated this Hotel";
}
}
catch (Exception ex)
{
}
}
VB:
Protected Sub Page_Load(sender As
Object, e As
System.EventArgs) Handles
Me.Load
If Not IsPostBack Then
BindRating()
End If
End Sub
Protected Sub BindRating()
Try
Dim
adp As New SqlDataAdapter("GetRating",
con)
adp.SelectCommand.CommandType = CommandType.StoredProcedure
Dim
dt As New DataTable()
adp.Fill(dt)
If
dt.Rows.Count > 0 Then
Rating1.CurrentRating = Convert.ToInt32(dt.Rows(0)("rating"))
lblmessage.Text = dt.Rows(0)("Totalcount") & "user(s) have rated this Hotel"
End
If
Catch
ex As Exception
End Try
End Sub
Now
build ,run the project and check the result.
Result:
If you get any problem, you can download the working example of this:
In this article we have learn to use the Ajax rating control. I hope you enjoyed this article.
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