C#

Delete and Update Data in Reverse Engineering POCO Generator

Delete Data - Reverse Engineering POCO Generator

 

Introduction

 

This article demonstrates an interesting and very useful concept in Entity Framework.

Question: What is the reverse engineering POCO generator?

 

In simple terms "It is a template that enables generation of entity classes by reverse engineering with the POCO generator".

Step 1: Create a new web application

 

New-project.png

 

Step 2: Adding a new Entity Framework reverse engineering POCO generator :

 

add-new-item.png

 

entity-framework-resource.png

 

Step 3: The complete code of WebForm1.aspx is as in the following:

 

<%@Page Language="C#"AutoEventWireup="true"CodeBehind="WebForm1.aspx.cs"Inherits="DeleteDataReverseEnggPOCOGenerator.WebForm1"%>

 

<!DOCTYPE htmlPUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

    <title></title>

</head>

<body>

    <formid="form1"runat="server">

    <center>

        <div>

            <table>

                <tr>

                    <tdcolspan="2"align="center">

                        <asp:LabelID="Label1"runat="server"Text="Delete Data - Reverse Engg. POCO Generator"

                            Font-Bold="true"Font-Size="Large"Font-Names="Verdana"ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:LabelID="Label2"runat="server"Text="Please Enter Employee Id" ForeColor="Brown"

                            Font-Bold="true"Font-Size="Medium"Font-Names="Verdana"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBoxID="TextBox1"runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <tdcolspan="2"align="center">

                        <asp:ButtonID="Button1"runat="server"Text="Delete Data"Font-Names="Verdana"Width="213px"

                            BackColor="Orange"Font-Bold="True"OnClick="Button1_Click"/>

                    </td>

                </tr>

                <tr>

                    <tdcolspan="2"align="center">

                        <asp:LabelID="Label3"runat="server"Font-Bold="true"Font-Size="Medium"Font-Names="Verdana"></asp:Label>

                    </td>

                </tr>

            </table>

        </div>

    </center>

    </form>

</body>

</html>

 

Step 4: The complete code of WebForm1.aspx.cs is as in the following:

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace DeleteDataReverseEnggPOCOGenerator

{

    publicpartial classWebForm1 : System.Web.UI.Page

    {

        protectedvoid Page_Load(object sender, EventArgs e)

        {

        }

        protectedvoid Button1_Click(object sender, EventArgs e)

        {

            if (string.IsNullOrEmpty(TextBox1.Text))

            {

                Label3.Text ="Please Enter Some Values";

                Label3.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                int id = int.Parse(TextBox1.Text);

                var query = (from r in objEntities.TblEmployee where r.EmpId == idselect r).Single();

                objEntities.TblEmployee.Remove(query);

                objEntities.SaveChanges();

                Label3.Text ="Data Deleted Successfully";

                Label3.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text =string.Empty;

            }

        }

        #region Instance MembersMyDbContext objEntities = new MyDbContext();

        #endregion

    }

}


Step 5: The complete code of web.config is as in the following:

<?xml version="1.0"encoding="utf-8"?>

<!--For more information on how to configure your ASP.NET application, please visithttp://go.microsoft.com/fwlink/?LinkId=169433-->

<configuration>

  <configSections>

    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->

    <sectionname="entityFramework"type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"requirePermission="false" />

  </configSections>

  <connectionStrings>

    <addname="ApplicationServices"connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" />

    <addname="MyDbContext"connectionString="Data Source=WIN-KV3BO1RQQF7;Initial Catalog=Company;Integrated Security=True;MultipleActiveResultSets=True" providerName="System.Data.SqlClient" />

  </connectionStrings>

  <system.web>

    <compilationdebug="true"targetFramework="4.0" />

    <authenticationmode="Forms">

      <formsloginUrl="~/Account/Login.aspx"timeout="2880" />

    </authentication>

    <membership>

      <providers>

        <clear />

        <addname="AspNetSqlMembershipProvider"type="System.Web.Security.SqlMembershipProvider"connectionStringName="ApplicationServices"enablePasswordRetrieval="false"enablePasswordReset="true"requiresQuestionAndAnswer="false"requiresUniqueEmail="false"maxInvalidPasswordAttempts="5"minRequiredPasswordLength="6"minRequiredNonalphanumericCharacters="0"passwordAttemptWindow="10"applicationName="/" />

      </providers>

    </membership>

    <profile>

      <providers>

        <clear />

        <addname="AspNetSqlProfileProvider"type="System.Web.Profile.SqlProfileProvider"connectionStringName="ApplicationServices"applicationName="/" />

      </providers>

    </profile>

    <roleManagerenabled="false">

      <providers>

        <clear />

        <addname="AspNetSqlRoleProvider"type="System.Web.Security.SqlRoleProvider"connectionStringName="ApplicationServices"applicationName="/" />

        <addname="AspNetWindowsTokenRoleProvider"type="System.Web.Security.WindowsTokenRoleProvider"applicationName="/" />

      </providers>

    </roleManager>

  </system.web>

  <system.webServer>

    <modulesrunAllManagedModulesForAllRequests="true" />

  </system.webServer>

  <entityFramework>

    <defaultConnectionFactorytype="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />

  </entityFramework>

</configuration>

 

Step 6: The output of the application is as in the following:

 

delete-data-in-reverse-engg.png

 

Step 7: The deleted data output of the application is as in the following:

 

delete-successfully.png

 

Update Data - Reverse Engineering POCO Generator

 

Question: What is reverse engineering POCO generator?

 

In simple terms "It is a template that enables generation of entity classes by reverse engineering with the POCO generator".

 

Step 1: Create a new web application

 

New project1.png

 

Step 2: Adding a new Entity Framework reverse engineering POCO generator:

 

add-new-item1.png

 

entityframwork1.png

 

Step 3: The complete code of WebForm1.aspx is as in the following:

 

<%@Page Language="C#"AutoEventWireup="true"CodeBehind="WebForm1.aspx.cs"Inherits="UpdateDataReverseEnggPOCOTemplate.WebForm1"%>

 

<!DOCTYPE htmlPUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

    <title></title>

</head>

<body>

    <formid="form1"runat="server">

    <center>

        <div>

            <table>

                <tr>

                    <tdcolspan="2">

                        <asp:LabelID="Label1"runat="server"Text="Update Data - Reverse Engg. POCO Generator"

                            Font-Bold="true"Font-Size="Large"Font-Names="Verdana"ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:LabelID="Label6"runat="server"Text="Please Enter Id" Font-Size="Large"Font-Names="Verdana"

                            Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBoxID="TextBox4"runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:LabelID="Label2"runat="server"Text="Please Enter First Name" Font-Size="Large"

                            Font-Names="Verdana"Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBoxID="TextBox1"runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:LabelID="Label3"runat="server"Text="Please Enter Last Name" Font-Size="Large"

                            Font-Names="Verdana"Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBoxID="TextBox2"runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:LabelID="Label4"runat="server"Text="Please Enter Age" Font-Size="Large"Font-Names="Verdana"

                            Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBoxID="TextBox3"runat="server"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <tdcolspan="2"align="center">

                        <asp:ButtonID="Button1"runat="server"Text="Update"Font-Names="Verdana"Width="213px"

                            BackColor="Orange"Font-Bold="True"OnClick="Button1_Click"/>

                    </td>

                </tr>

                <tr>

                    <tdcolspan="2"align="center">

                        <asp:LabelID="Label5"runat="server"Font-Bold="true"Font-Names="Verdana"ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

            </table>

        </div>

    </center>

    </form>

</body>

</html>


 

Step 4: The complete code of WebForm1.aspx.cs is as in the following:

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace UpdateDataReverseEnggPOCOTemplate

{

    publicpartial classWebForm1 : System.Web.UI.Page{protectedvoid Page_Load(object sender, EventArgs e)

    {

    }

        protectedvoid Button1_Click(object sender, EventArgs e)

        {

            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text) ||string.IsNullOrEmpty(TextBox3.Text) ||string.IsNullOrEmpty(TextBox4.Text))

            {

                Label5.Text ="Please Enter Some Data";

                Label5.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                var id1 = Convert.ToInt32(TextBox4.Text);

                var objEmployee = objEntities.TblEmployee.Where(a => a.EmpId == id1).FirstOrDefault();

                objEmployee.FirstName = TextBox1.Text;

                objEmployee.LastName = TextBox2.Text;

                objEmployee.Age =int.Parse(TextBox3.Text);

                objEntities.SaveChanges();

                Label5.Text ="Data Updated Successfully";

                Label5.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text =string.Empty;

                TextBox2.Text =string.Empty;

                TextBox3.Text =string.Empty;TextBox4.Text =string.Empty;

            }

        }

        #region Instance MembersMyDbContext objEntities = new MyDbContext();

        #endregion

    }

}

 

Step 5: The complete code of web.config is as in the following:

 

<?xml version="1.0"encoding="utf-8"?>

<!--For more information on how to configure your ASP.NET application, please visithttp://go.microsoft.com/fwlink/?LinkId=169433-->

<configuration>

  <configSections>

    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->

    <sectionname="entityFramework"type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"requirePermission="false" />

  </configSections>

  <connectionStrings>

    <addname="ApplicationServices"connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" />

    <addname="MyDbContext"connectionString="Data Source=WIN-KV3BO1RQQF7;Initial Catalog=Company;Integrated Security=True;MultipleActiveResultSets=True" providerName="System.Data.SqlClient" />

  </connectionStrings>

  <system.web>

    <compilationdebug="true"targetFramework="4.0" />

    <authenticationmode="Forms">

      <formsloginUrl="~/Account/Login.aspx"timeout="2880" />

    </authentication>

    <membership>

      <providers>

        <clear />

        <addname="AspNetSqlMembershipProvider"type="System.Web.Security.SqlMembershipProvider"connectionStringName="ApplicationServices"enablePasswordRetrieval="false"enablePasswordReset="true"requiresQuestionAndAnswer="false"requiresUniqueEmail="false"maxInvalidPasswordAttempts="5"minRequiredPasswordLength="6"minRequiredNonalphanumericCharacters="0"passwordAttemptWindow="10"applicationName="/" />

      </providers>

    </membership>

    <profile>

      <providers>

        <clear />

        <addname="AspNetSqlProfileProvider"type="System.Web.Profile.SqlProfileProvider"connectionStringName="ApplicationServices"applicationName="/" />

      </providers>

    </profile>

    <roleManagerenabled="false">

      <providers>

        <clear />

        <addname="AspNetSqlRoleProvider"type="System.Web.Security.SqlRoleProvider"connectionStringName="ApplicationServices"applicationName="/" />

        <addname="AspNetWindowsTokenRoleProvider"type="System.Web.Security.WindowsTokenRoleProvider"applicationName="/" />

      </providers>

    </roleManager>

  </system.web>

  <system.webServer>

    <modulesrunAllManagedModulesForAllRequests="true" />

  </system.webServer>

  <entityFramework>

    <defaultConnectionFactorytype="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />

  </entityFramework>

</configuration>


Step 6: The output of the application is as in the following:

 

Insert-information.png

 

Step 7: The updated data output of the application is as in the following:

 

update-data-successfully.png

 

I hope this article was useful for you. I look forward to your comments and feedback. Thanks Vijay.

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