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ASP.NET 4.5.1 - with ASPHostPortal.com :: SEO friendly URLs with ASP.NET

clock February 26, 2014 06:51 by author Kenny

Search engines like human-readable URLs with keywords in it, and hesitate to respect messy URLs with a lot of query-string parameters. So, to make our ASP.NET database-driven website SEO-friendly we have to get rid of our complex URLs.

SEO or Search Engine Optimization is the process of affecting the visibility of a website or a web page in a search engine's "natural" or un-paid ("organic") search results. In general, the earlier (or higher ranked on the search results page), and more frequently a site appears in the search results list, the more visitors it will receive from the search engine's users. SEO may target different kinds of search, including image search, local search, video search, academic search, news search and industry-specific vertical search engines.

Solution 1: Fake pages and "Server.Transfer".
As you can see the two URLs above point to the same page. Basically it is the same page and it works like this: the page mailjet-newsletter-software.aspx contains no code at all and performs a Server.Transfer (aka server-side redirect) to product.aspx like this:
Server.Transfer("product.aspx?ProductID=18");
That's it. We have one "product.aspx" page which expects a "ProductID" parameter and a lot of "fake pages" with SEO-friendly names like firstproduct.aspx, secondproduct.aspx etc., which simply perform a Server.Transfer to the "product.aspx" with the right ProductID.

Simple, isn't it?

But this solution requires a lot of hard-coding - we will have to create all these fake pages and add a Server.Transfer command. So let's go a little further: we will create one base class for all our "fake pages" and add a record to the "tblProducts" table in the database:

Now we have to create our fake pages, inherit them all from the ProductPage class and voi la - that's it! We can also optionally remove all the HTML-code from the aspx-files, leaving the "Page" directive only.

Solution 2: Virtual Pages.

This method is pretty similar, except that we don't need to create any pages at all. Instead, we will add an HttpModule, which intercepts HTTP requests, and the user requests a non-existent page, performs a Rewrite operation. First we will create our HttpModule:

Now we have to register our HttpModule in the web.config:

<httpModules>
<add type="URLRewrite.ProductPageModule, URLRewrite" name="ProductPageModule" />
<httpModules>



ASP.NET 4.5.1 - with ASPHostPortal.com :: How to Create Dynamic DropDownLists in ASP.NET 4.5.1

clock February 26, 2014 06:23 by author Kenny

Now i will tell you how to create Dynamic DropDownLists in ASP.NET 4.5.1

Object:

1. Create dropdownlist dynamically with autopostback property true
2. Keep dropdownlist during postback
3. Maintain selected value during postback.
Here is the sample for this.

In aspx page:
<form
id="form1" runat="server">

    <div>

        <asp:Table ID="tbl" runat="server">

        </asp:Table>

        <asp:Button ID="btnSet" runat="server" Text="Button" onclick="btnSet_Click" /> </div>

    </form>

To Create Dynamic Dropdownlist:

protected
void Page_Load(object sender, EventArgs e)

{

    if (!Page.IsPostBack)

    {

    CreateDynamicTable();

    }

}

    private void CreateDynamicTable()

    {  

        // Fetch the number of Rows and Columns for the table

        // using the properties

        int tblRows = 3;

        int tblCols = 3;

        // Now iterate through the table and add your controls

        for (int i = 0; i < tblRows; i++)

        {

            TableRow tr = new TableRow();

            for (int j = 0; j < tblCols; j++)

            {

                TableCell tc = new TableCell();

                DropDownList ddl = new DropDownList();

                ddl.ID = "ddl-" + i.ToString() + "-" + j.ToString();

                for (int k = 0; k < 5; k++)

                {

                    ddl.Items.Add(new ListItem("item-"+k.ToString(),k.ToString())); 

                }

                ddl.AutoPostBack = true;

                ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);

                // Add the control to the TableCell

                tc.Controls.Add(ddl);

                // Add the TableCell to the TableRow

                tr.Cells.Add(tc);

            }

            // Add the TableRow to the Table

            tbl.Rows.Add(tr);

            tbl.EnableViewState = true;

            ViewState["tbl"] = true;

        }

    }

protected void ddl_SelectedIndexChanged(object sender, EventArgs e)

    {

    // what you want to perform    

    }

To retrieve value on button click:

protected
void btnSet_Click(object sender, EventArgs e)

    {

        foreach (TableRow tr in tbl.Controls )

        {

            foreach (TableCell tc in tr.Controls)

            {

                if (tc.Controls[0] is DropDownList)

                {

                    Response.Write(((DropDownList)tc.Controls[0]).SelectedItem.Text+" ");        

                }

            }

            Response.Write("<br/>"); 

        }

    }
Right Now, No output because dynamic controls are lost in postback then what to do.

So we need to save dynamic controls value and generate dynamic controls again.we need to maintain viewstate.

protected
override object SaveViewState()

{

    object[] newViewState = new object[2];

    List<string> txtValues = new List<string>();

    foreach (TableRow row in tbl.Controls)

    {

        foreach (TableCell cell in row.Controls)

        {

            if (cell.Controls[0] is DropDownList)

            {

                txtValues.Add(((DropDownList)cell.Controls[0]).SelectedIndex.ToString());

            }

        }

    }

    newViewState[0] = txtValues.ToArray();

    newViewState[1] = base.SaveViewState();

    return newViewState;

}

protected override void LoadViewState(object savedState)

{

    //if we can identify the custom view state as defined in the override for SaveViewState

    if (savedState is object[] && ((object[])savedState).Length == 2 && ((object[])savedState)[0] is string[])

    {

        object[] newViewState = (object[])savedState;

        string[] txtValues = (string[])(newViewState[0]);

        if (txtValues.Length > 0)

        {

            //re-load tables

            CreateDynamicTable();

            int i = 0;

            foreach (TableRow row in tbl.Controls)

            {

                foreach (TableCell cell in row.Controls)

                {

                    if (cell.Controls[0] is DropDownList && i < txtValues.Length)

                    {

                        ((DropDownList)cell.Controls[0]).SelectedIndex = Convert.ToInt32(txtValues[i++]);

                    }

                }

            }

        }

        //load the ViewState normally

        base.LoadViewState(newViewState[1]);

    }

    else

    {

        base.LoadViewState(savedState);

    }

}



ASP.NET 4.5.1- with ASPHostPortal.com :: How to Create Barcodes using ASP.NET App

clock February 26, 2014 05:09 by author Kenny

To create barcodes we will use ASP.NET web services. Not only that, we will also create Windows Forms and Console application to request barcode image.

What is The Benefits?

Well, web services provide a major benefit in integrating the software with external applications. With standardized request/response model, any client application that can utilize XML web service can benefit from it.Below is the brief visual representation of the barcode service. The clients do not need to refer to Aspose.BarCode for .NET. They will just send 2 string values (codetext and symbology) and will get the barcode image (byte array) from service.

Barcode Web Service
Now, open Microsoft Visual Studio. Create a new project of type “ASP.NET Web Service Application”. Name the project as “BarCodeService”. Add reference to the following .NET assemblies.

  1. System.Drawing from .NET tab of “Add Reference” dialog box
  2. Aspose.BarCode.

Browse to the location where Aspose.BarCode for .NET is installed and select. Visual Studio adds a default class “Service1” to the Web Service project in Service1.asmx file.
Open it and add the following method to this class.

The web method needs the following two parameters from client:

  1. Codetext
  2. Symbology

These parameters are of String type. The parameters are passed to the BarCodeBuilder class, which then creates the barcode and sends the barcode image in the form of byte array to the client.
This web method can be called by any kind of application that can consume a web service.


Consume Web Service from Windows Forms Application

Open Visual Studio and create a new project of type “Windows Application”. Name the project as “ GetBarCodeWinForms ”. Add reference to the web service by right clicking on “References” and then choosing “Add Service Reference” from the context menu. Type the address of web service or discover it. After getting the correct service, give “BarCodeService” in the Namespace and click on “Ok” button to add the reference.

Design the forms as follows.

It contains the following controls:

  1. Textbox: Input codetext from user
  2. Combobox: Input symbology type from user
  3. Button: Call web service
  4. Picturebox: Display the barcode image

Write the following code on click event of the button.

Run the application, specify some values and click on the “Get Barcode” button. The application will consume the barcode web service and get the barcode image from it. The image will then be displayed on the form as below.

Consume Web Service from a Console Application

Create a new project in Visual Studio and choose “Console Application” in project type. Name the project as “ GetBarCodeConsole ”. Add the reference to the barcode service, just as we gave above in the winforms application.Write the below code in the main() method.

Run the application, it will consume the barcode web service, get barcode image and save the image locally to disk.

Summary

Aspose.BarCode for .NET can easily be used in ASP.NET web services to generate the barcodes and serve the barcode image to various clients.



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