Wednesday, September 23, 2015

Creating an image gallery using asp.net and c#

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In this video, we will discuss creating an image gallery using asp.net and c#.  The images in the galley should be displayed as click-able thumbnails. Upon clicking the thumbnail, the user should be redirected to a page, where he can see the original image. Upon uploading an image, the image should be added to the gallery immediately. The output should be as shown below.
image gallery using asp.net and c#



The images used in the demo can be found at the following link
http://windows.microsoft.com/en-GB/windows/wallpaper

Add "Data" folder to the project. This folder stores the uploaded images.

WebForm1.aspx
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Upload" OnClick="Button1_Click" />
<asp:Panel ID="Panel1" runat="server" Width="440px"
    BorderStyle="Dashed" BorderColor="#000066">
</asp:Panel>

WebForm1.aspx.cs
public partial class WebForm1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        LoadImages();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            string fileName = FileUpload1.FileName;
            FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Data/") + fileName);
        }
        Response.Redirect("~/WebForm1.aspx");
    }

    private void LoadImages()
    {
        foreach (string strfile in Directory.GetFiles(Server.MapPath("~/Data")))
        {
            ImageButton imageButton = new ImageButton();
            FileInfo fi = new FileInfo(strfile);
            imageButton.ImageUrl = "~/Data/" + fi.Name;
            imageButton.Height = Unit.Pixel(100);
            imageButton.Style.Add("padding", "5px");
            imageButton.Width = Unit.Pixel(100);
            imageButton.Click += new ImageClickEventHandler(imageButton_Click);
            Panel1.Controls.Add(imageButton);
        }
    }

    protected void imageButton_Click(object sender, ImageClickEventArgs e)
    {
        Response.Redirect("WebForm2.aspx?ImageURL="
            ((ImageButton)sender).ImageUrl);
    }
}

WebForm2.aspx
<asp:Button ID="Button2" Text="Back to Gallery" runat="server" onclick="Button1_Click" />
<br /><br />
<asp:Image ID="Image1" Width="800px" Height="550px" runat="server" />
<br /><br />
<asp:Button ID="Button1" Text="Back to Gallery" runat="server" onclick="Button1_Click" />

WebForm2.aspx.cs
public partial class WebForm2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Image1.ImageUrl = Request.QueryString["ImageURL"];
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("WebForm1.aspx");
    }
}


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