Bind dynamically items in dropdownlists

In this tutorial I will show you how to bind items dynamically in dropdownlist.

in this example, i have used hyperlinks and bind the selected link in a single dropdownlist
I have used query string  for passing the value in the dropdownlist to show what items to be displayed.
you can also use session variables and also cookies for binding items on the list.

this is WebForm1.aspx

protected void Page_Load(object sender, EventArgs e)
        {
            createNavUrls();
        }
        private void createNavUrls()
        {
         
                HyperLink1.NavigateUrl = @"WebForm2.aspx?Option=1";
           
                HyperLink2.NavigateUrl = @"WebForm2.aspx?Option=2";
         
                HyperLink3.NavigateUrl = @"WebForm2.aspx?Option=3";
        }

this piece of code shows, when the page load, the code will call the createNavUrls(), that adds the navigate url links and shows the query string,, upon selecting on the links it has corresponding values,1,2,3 and the query string name is "Option".

WebForm2.aspx

 protected void Page_Load(object sender, EventArgs e)
        {
            filllist(Convert.ToInt32(Request.QueryString["Option"]));
        }
        private void filllist(int option)
        {
            ddlOptions.Items.Clear();
            if (option == 1)
            {
                ddlOptions.Items.Add("a1");
                ddlOptions.Items.Add("a2");
                ddlOptions.Items.Add("a3");
            }
            else if (option == 2)
            {
                ddlOptions.Items.Add("b4");
                ddlOptions.Items.Add("b5");
                ddlOptions.Items.Add("b6");
            }
            else if (option == 3)
            {
                ddlOptions.Items.Add("c7");
                ddlOptions.Items.Add("c8");
                ddlOptions.Items.Add("c9");
            }
        }

on the other hand, the second page will load, the selected hyperlink's value,

on the page load , the Request.QueryString["Option"], this will read the value given by the 1st page,
then on the method fill,  this will add the items that is selected on the desired input.

here is the sample url of the page.
"http://localhost:56594/WebForm2.aspx?Option=1"

Option is the querystring name and 1 is the value


i hope this code helps.

Adding table to a session

On this post I will show you ,how to add a table to a session and even add a new record, just like a Shopping cart in online shopping websites.

Here is a sample code for adding a table to a session and then rebinding it just like in shopping carts

private void GetData()
{
     try
        {
        DataRow[] dr = null;        if (ViewState["SelectedRecords"] != null)
       {
            dt = (DataTable)ViewState["SelectedRecords"];
       }
       else
       {
            dt = CreateDataTable();    1:
        }

2
CheckBox chkAll = (CheckBox)gvAll.HeaderRow.Cells[0].FindControl("chkAll");
for (int i = 0; i < gvAll.Rows.Count; i++)
{
if (chkAll.Checked)
{
dt = AddRow(gvAll.Rows[i], dt);
}
else
{
CheckBox chk = (CheckBox)gvAll.Rows[i].Cells[0].FindControl("chk");
if (chk.Checked)
{
dt = AddRow(gvAll.Rows[i], dt);
}
else
{
dt = RemoveRow(gvAll.Rows[i], dt);
}
}
}

3.
ViewState["SelectedRecords"] = dt;
dtall = dt.Copy();
Session["CombineRecord"] = dtall;
}
catch (Exception ex)
{
}

this is your main method on how to add or remove items in your datatable, in this example I bound it to a gridview, which have a checkbox for adding or deleting items, this depends on the button clicked

1: means create a datatable
here is the code for creating a datatable

private DataTable CreateDataTable()
{
DataTable dt = new DataTable();
dt.Columns.Add("ItemCode");
dt.Columns.Add("ItemDesc");
dt.AcceptChanges();
return dt;
}

2: this part shows what is the behavior if the checkbox is selected and what button is clicked, either add or remove, 

3: this part shows after selecting after modifying the datatable, you will then pass it to the viewstate named selectedrecords to hold it,

then dtall=dt.copy(); means that all records in the datatable dt is copied and moved to datatable named dtall

where dtall will either have an existing record or a new record

then pass dtall datatable to a session variable so that it will not be disposed after

After this,

private void BindSecondaryGrid()
{
gvCart.DataSource = (DataTable)Session["CombineRecord"];
gvCart.DataBind();
}

convert to datatable the session variable and bind it to your gridview.

This summarizes the passing of values to a session just like in Shopping cart

Mt. Pulag December Climb

Feel the Coldness in Mt. Pulag this December 21-24,as we will climb this mountain on the said date
plus be ware of the fees
this is just baguio-pulag-baguio trip
Guide - 100/head
Jeepney -9k roundtrip

For those who wants to join this adventure, you may put your comment guys,
Check your sched now as i will be updatting this post guys.

Thanks.

Manabu Peak Night Trek

Guys, here is the Itinerary for the Manabu peak Night trek, that will happen on Oct 5-6 2012, but first here is the details of manabu peak

This peak is a part of Malipunyo mountain range, located in Sto. Tomas Batangas, its peak is marked by a white cross, and its trail is like a rosary, basically this mountain is for beginners and it has an easy trail.

below are the description of this peak

 Jump - off point :  Sulok, Brgy. Sta Cruz, Sto. Tomas

 LLA: 13.9777°, 121.2413°, 760 MASL

Days required / Hours to summit: 1 day / 1-2 hours

Specs: Minor climb, Difficulty 2/9, Trail class 1-2

Itinerary:

1800H : Robinsons Pala pala

1930H:: Fiesta mall Lipa, take trike to Sulok, brgy Sta Cruz

2000H: ETA Jump-off

2015H start Trek, Grotto Trail

2115H rest Grotto

2130H resume trek

2230H ETA Summit, Set up Camp , Socials

0030H Lights out

0600H Wake up Call , Breakfast , Explore Summit, picture taking

0900H break camp prepare , descent

1100H Jump off point, take a shower

1200H ETD to Fiesta mall

1300H fiesta mall , lunch

1500H Pala pala

1600H Home

For those who wants to join this adventure, you may put your comment guys

Thanks.