Silverlight CRUD Operations Using WCF Service

Raj Kumar
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This articles demonstrates how to use Silverlight CRUD operations using a WCF service. We will use a Data Grid data control.

Create a new Silverlight project using .NET Framework 4.

Image 1.

You will see the project layout like this. The web project works like a server project with all the database related classes and services, .aspx test pages, configuration file and the other project has all the .xaml pages controls.

Image 2.

Now add a new Silverlight enabled WCF service.

Image 3.

In this sample I am using the Northwnd database available in the App_Data folder. First add a new class to the web project.

Customers.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace SilverlightCRUD_Using_WCFService.Web
{
public class Customers
    {
public string CustomerID { get; set; }
public string CompanyName { get; set; }
public string ContactName { get; set; }
public string ContactTitle { get; set; }
    }
}

Now add functions to the service class. This is the connection string.

string conn = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\NORTHWND.MDF;Integrated Security=True;User Instance=True";

Add these namespaces to the service class.

using System.Data.SqlClient;
using System.Collections.Generic;

This function is used for the customer records from the database:

[OperationContract]
public List<Customers>GetAllCustomers()
{
List<Customers> customers = new List<Customers>();
using (SqlConnection con = new SqlConnection(conn))
{
using (SqlCommandcmd = new SqlCommand())
{
//cmd.CommandText = "GetAllCustomers";
cmd.CommandText = "Select CustomerID,CompanyName,ContactName,ContactTitle From Customers";
cmd.Connection = con;
//cmd.CommandType = System.Data.CommandType.StoredProcedure;
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
Customers customer = new Customers();
customer.CustomerID = Convert.ToString(reader["CustomerID"].ToString());
customer.CompanyName = Convert.ToString(reader["CompanyName"]);
customer.ContactName = Convert.ToString(reader["ContactName"]);
customer.ContactTitle = Convert.ToString(reader["ContactTitle"]);
customers.Add(customer);
}
}
}

return customers;
}

This method is used to update customer information.

[OperationContract]
public int UpdateCustomer(Customers customer)
{
using (SqlConnection con = new SqlConnection(conn))
{
using (SqlCommand cmd = new SqlCommand())
{
string CommandText = "UPDATE Customers" +
" SET(CompanyName = @CompanyName, ContactName = @ContactName, ContactTitle = @ContactTitle)" +
" WHERECustomerID =" + customer.CustomerID;
cmd.CommandText = "Update Customers SET CompanyName=@CompanyName,ContactName=@ContactName,ContactTitle=@ContactTitle WHERE CustomerID = @CustomerID";
//cmd.CommandText = CommandText;
cmd.Connection = con;
//cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.Parameters.Add("@CustomerID", System.Data.SqlDbType.VarChar).Value = customer.CustomerID;
cmd.Parameters.Add("@CompanyName", System.Data.SqlDbType.VarChar).Value = customer.CompanyName;
cmd.Parameters.Add("@ContactName", System.Data.SqlDbType.VarChar).Value = customer.ContactName;
cmd.Parameters.Add("@ContactTitle", System.Data.SqlDbType.VarChar).Value = customer.ContactTitle;
con.Open();
returnConvert.ToInt32(cmd.ExecuteScalar());
}
}

}

This method inserts a new customer entry in the database.

[OperationContract]
public int InsertCustomer(Customers customer)
{
using (SqlConnection con = new SqlConnection(conn))
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.CommandText = "INSERT INTO Customers(CustomerID,CompanyName,ContactName,ContactTitle) Valu(@CustomerID,@CompanyName,@ContactName,@ContactTitle)";
cmd.Connection = con;
//cmd.CommandType = System.Data.CommandType.StoredProcedure;

cmd.Parameters.Add("@CustomerID", System.Data.SqlDbType.VarChar).Value = customer.CustomerID;
cmd.Parameters.Add("@CompanyName", System.Data.SqlDbType.VarChar).Value = customer.CompanyName;
cmd.Parameters.Add("@ContactName", System.Data.SqlDbType.VarChar).Value = customer.ContactName;
cmd.Parameters.Add("@ContactTitle", System.Data.SqlDbType.VarChar).Value = customer.ContactTitle;
con.Open();

returnConvert.ToInt32(cmd.ExecuteScalar());
}
}

}

This method is used to delete customer details from the database.

[OperationContract]
public bool DeleteCustomer(string customerId)
{
using (SqlConnection con = new SqlConnection(conn))
{
using (SqlCommandcmd = new SqlCommand())
{
cmd.CommandText = "Delete FROM Customers Where CustomerID = @CustomerID";
cmd.Connection = con;
//cmd.CommandType = System.Data.CommandType.StoredProcedure;

cmd.Parameters.Add("@CustomerID", System.Data.SqlDbType.VarChar).Value = customerId;

con.Open();

returnConvert.ToBoolean(cmd.ExecuteNonQuery() > 0);
}
}
}

Here we have completed the service work. Now let's start working on the UI part. First of all add a service reference to the project.

Image 4.

Now discover the service reference and click OK.

Image 5.

Start working on the MainPage.xaml now.

<UserControl x:Class="SilverlightCRUD_Using_WCFService.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
mc:Ignorable="d"
d:DesignHeight="500" d:DesignWidth="450"
xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk">

</Grid>
</UserControl>

MainPage.xaml.cs.

Add the service namespace.

using SilverlightCRUD_Using_WCFService.ServiceReference1;

This code and events are used to show customer details.

public MainPage()
{
InitializeComponent();
customerGrid.Columns.Add(new DataGridTextColumn
{
Header = "CustomerID",
Binding = new Binding("CustomerID"),
});

customerGrid.Columns.Add(new DataGridTextColumn
{
Header = "CompanyName",
Binding = newBinding("CompanyName"),
Width = newDataGridLength(140)

});

customerGrid.Columns.Add(new DataGridTextColumn
{
Header = "ContactName",
Binding = new Binding("ContactName"),
Width = new DataGridLength(100)
});

customerGrid.Columns.Add(new DataGridTextColumn
{
Header = "ContactTitle",
Binding = new Binding("ContactTitle"),
});

LoadCustomersGrid();

}
private void LoadCustomersGrid()
{
CustomerServiceClient customer = new CustomerServiceClient();
customer.GetAllCustomersCompleted += new EventHandler<GetAllCustomersCompletedEventArgs>(customer_GetAllCustomersCompleted);
customer.GetAllCustomersAsync();
}

void customer_GetAllCustomersCompleted(object sender, GetAllCustomersCompletedEventArgs e)
{
PagedCollectionView pageCollectionView = new PagedCollectionView(e.Result);
dataPager1.DataContext = pageCollectionView;
customerGrid.ItemsSource = pageCollectionView;
}

Now run the application.

Image 6.

This piece of code is used to show row details in text boxes.

private void customerGrid_LoadingRow(object sender, DataGridRowEventArgs e)
{
e.Row.MouseLeftButtonUp += newMouseButtonEventHandler(Row_MouseLeftButtonUp);
}

void Row_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
Customers customer = customerGrid.SelectedItem as Customers;
CustomerIDtextBox.Text = customer.CustomerID;
ContactNametextBox.Text = customer.ContactName;
ContactTitletextBox.Text = customer.ContactTitle;
CompanyNametextBox.Text = customer.CompanyName;
}

Image 7.

This code and event is used to update the selected record.

private void UpdateButton_Click(object sender, RoutedEventArgs e)
{
if (Validate())
{
CustomerServiceClient customerServiceClient = new CustomerServiceClient();
customerServiceClient.UpdateCustomerCompleted += newEventHandler<UpdateCustomerCompletedEventArgs>(customerServiceClient_UpdateCustomerCompleted);
Customers customer = new Customers();
customer.CustomerID = CustomerIDtextBox.Text;
customer.CompanyName = CompanyNametextBox.Text;
customer.ContactName = ContactNametextBox.Text;
customer.ContactTitle = ContactTitletextBox.Text;
customerServiceClient.UpdateCustomerAsync(customer);
}
}

void customerServiceClient_UpdateCustomerCompleted(object sender, UpdateCustomerCompletedEventArgs e)
{
if (e.Result> -1)
{
MessageBox.Show("Record Updated Successfully", "Update", MessageBoxButton.OK);
ClearTextBoxes();
LoadCustomersGrid();
}
}

private void ClearTextBoxes()
{
CustomerIDtextBox.Text = string.Empty;
CompanyNametextBox.Text = string.Empty;
ContactNametextBox.Text = string.Empty;
ContactTitletextBox.Text = string.Empty;
CustomerIDtextBox.Focus();
}

private bool Validate()
{
if (CustomerIDtextBox.Text.Trim().Length == 0)
{
MessageBox.Show("Name cannot be blank", "Error", MessageBoxButton.OK);
CustomerIDtextBox.Focus();
returnfalse;
}
elseif (CompanyNametextBox.Text.Trim().Length == 0)
{
MessageBox.Show("Name cannot be blank", "Error", MessageBoxButton.OK);
CompanyNametextBox.Focus();
returnfalse;
}
elseif (ContactNametextBox.Text.Trim().Length == 0)
{
MessageBox.Show("Phone No cannot be blank", "Error", MessageBoxButton.OK);
ContactNametextBox.Focus();
returnfalse;
}
elseif (ContactTitletextBox.Text.Trim().Length == 0)
{
MessageBox.Show("Phone No cannot be blank", "Error", MessageBoxButton.OK);
ContactTitletextBox.Focus();
returnfalse;
}
else
{
returntrue;
}
}

Image 8.

Note: No need to update the Customer ID because it is the primary key.

And click Update.

Image 9.

This code and event is used to insert a new record entry.

private void Insertbutton_Click(object sender, RoutedEventArgs e)
{
if (Validate())
{
CustomerServiceClient customerServiceClient = new CustomerServiceClient();
customerServiceClient.InsertCustomerCompleted += newEventHandler<InsertCustomerCompletedEventArgs>(customerServiceClient_InsertCustomerCompleted);
Customers customer = new Customers();
customer.CustomerID = CustomerIDtextBox.Text;
customer.CompanyName = CompanyNametextBox.Text;
customer.ContactName = ContactNametextBox.Text;
customer.ContactTitle = ContactTitletextBox.Text;
customerServiceClient.InsertCustomerAsync(customer);
}
}

void customerServiceClient_InsertCustomerCompleted(object sender, InsertCustomerCompletedEventArgs e)
{
if (e.Result> -1)
{
MessageBox.Show("Record Inserted Successfully", "Insert", MessageBoxButton.OK);
ClearTextBoxes();
LoadCustomersGrid();
}
}

Now run the application and put a new entry in text boxes.

Image 10.

Click the Insert button now.

Image 11.

This code and event is used to delete the selected row entry.

private void Deletebutton_Click(object sender, RoutedEventArgs e)
{
if (CustomerIDtextBox.Text == "")
{
MessageBox.Show("Select a record to delete", "Delete", MessageBoxButton.OK);
}
else
{
if (MessageBox.Show("Are you sure you want to delete ? ", "Delete", MessageBoxButton.OKCancel) == MessageBoxResult.OK)
{

CustomerServiceClient customerServiceClient = new CustomerServiceClient();
customerServiceClient.DeleteCustomerCompleted += newEventHandler<DeleteCustomerCompletedEventArgs>(customer_DeleteCustomerCompleted);
customerServiceClient.DeleteCustomerAsync(CustomerIDtextBox.Text);
}
}
}

void customer_DeleteCustomerCompleted(object sender, DeleteCustomerCompletedEventArgs e)
{
if (e.Result)
{
MessageBox.Show("Record Deleted", "Delete", MessageBoxButton.OK);
ClearTextBoxes();
LoadCustomersGrid();
}
else
{
MessageBox.Show("Deletion failed", "Delete", MessageBoxButton.OK);
}
}

Image 12.

We are done here with Silverlight CRUD using a WCF service. If you have questions and comments related to this article then drop me a line in the C# corner comment section.

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