Create a Picture Album Gallery using GridView in ASP.Net

This will create a folder directory as follows

~/Images/Flower/April_2014/FileName.jpg

HTML:

<form id="form1" runat="server">
    <div>
    Please Select Category
        <asp:DropDownList ID="ddlCategories" runat="server" AutoPostBack="true" OnSelectedIndexChanged="Categories_OnSelectedIndexChanged">
            <asp:ListItem Text="Please Select" Value="0" />
            <asp:ListItem Text="Animal" Value="Animal" />
            <asp:ListItem Text="Flower" Value="Flower" />
        </asp:DropDownList>
        <br />
        <br />
        Please Select Year and Month
        <asp:DropDownList ID="ddlMonths" runat="server">
            <asp:ListItem Text="April" Value="April" />
            <asp:ListItem Text="May" Value="May" />
        </asp:DropDownList>
        <asp:DropDownList ID="ddlYears" runat="server">
            <asp:ListItem Text="2014" Value="2014" />
            <asp:ListItem Text="2013" Value="2013" />
        </asp:DropDownList>
        <br />
        <br />
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <br />
        <br />
        <asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="Upload" />
        <hr />
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" ShowHeader="false">
            <Columns>
                <asp:BoundField DataField="Text" />
                <asp:ImageField DataImageUrlField="Value" ControlStyle-Height="100" ControlStyle-Width="100" />
            </Columns>
        </asp:GridView>
    </div>
    </form>

C#:

protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            this.PopulateGridView(this.ddlCategories.SelectedItem.Value);
        }
    }

    protected void Upload(object sender, EventArgs e)
    {
        if (this.FileUpload1.HasFile)
        {
            string yearMonth = string.Format("{0}_{1}", this.ddlMonths.SelectedItem.Value, this.ddlYears.SelectedItem.Value);
            DirectoryInfo directoryInfo = new DirectoryInfo(Server.MapPath("~/Images/" + this.ddlCategories.SelectedItem.Value + "/" + yearMonth));
            if (!directoryInfo.Exists)
            {
                directoryInfo.Create();
            }

            this.FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Images/" + this.ddlCategories.SelectedItem.Value + "/" + yearMonth + "/") + FileUpload1.FileName);
            this.PopulateGridView(this.ddlCategories.SelectedItem.Value);
        }
    }

    protected void Categories_OnSelectedIndexChanged(object sender, EventArgs e)
    {
        this.PopulateGridView(this.ddlCategories.SelectedItem.Value);
    }

    private void PopulateGridView(string category)
    {
        string yearMonth = string.Format("{0}_{1}", this.ddlMonths.SelectedItem.Value, this.ddlYears.SelectedItem.Value);
        if (category != "0")
        {
            DirectoryInfo directoryInfo = new DirectoryInfo(Server.MapPath("~/Images/" + this.ddlCategories.SelectedItem.Value + "/" + yearMonth));
            if (directoryInfo.Exists)
            {
                string[] filePaths = Directory.GetFiles(Server.MapPath("~/Images/" + category + "/" + yearMonth));
                List<ListItem> files = new List<ListItem>();
                foreach (string filePath in filePaths)
                {
                    string fileName = Path.GetFileName(filePath);
                    files.Add(new ListItem(fileName, "~/Images/" + category + "/" + yearMonth + "/" + fileName));
                }
                this.GridView1.DataSource = files;
                this.GridView1.DataBind();
            }
            else
            {
                this.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "alert('No Such Directory Exists. Please Upload The File')", true);
            }
        }
    }

Image:

Thank You.