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A Simple example with a ListBox

Posted By:Syed Shakeer Hussain       Posted Date: June 09, 2009    Points: 25    Category: ASP.NET    URL: http://www.dotnetspark.com  
 

A Simple example with a ListBox.

In this Article i am going to explain you how to transfer a Item from one ListBox to another ListBox.Here i taken two ListBoxes,I added one Some Items in first ListBox.When the user select a Item from first ListBox it has to show in another listBox. 

  Below Image shows how to Add Items in a ListBox

After Adding Click Ok.Add Some Buttons for select,Remove,Select all,remove all.Then your Listbox as shows as in below image

Here Select Button is used to Select a user Only one Item.Remove Button is used to remove onely one Item from second listbox.SelectAll Button is used to send  all items from first listbox to second ListBox.RemoveAll Button is used to remove all selected Items from Second ListBox.

Use the Below code in Select Butteon to send a SelectedItem from first ListBox to Second ListBox

protected void Select_Click1(object sender, EventArgs e)

   {

 

                ListItem li = new ListItem();

                li.Text = selecteditem;

                li.Value = selecteditem;

                ListBox2.Items.Add(li);

}

 

if the user dont want to allow  repeted Items in second ListBox then use below code

protected void Select_Click1(object sender, EventArgs e)

    {

      bool  flag = false;

        string selecteditem = ListBox1.SelectedItem.Text;

        if (ListBox2.Items.Count >= 1)

        {

            for (int i = 0; i < ListBox2.Items.Count; i++)

            {

                if (selecteditem == ListBox2.Items[i].Text)

                {

                    Response.Write("Already Item Selected");

                    flag =true;

                }

            }

 

            if (flag == false)

            {

                ListItem li = new ListItem();

                li.Text = selecteditem;

                li.Value = selecteditem;

                ListBox2.Items.Add(li);

             }  

           

        }

        else

        {

 

            ListItem li = new ListItem();

            li.Text = selecteditem;

            li.Value = selecteditem;

            ListBox2.Items.Add(li);

        }

       

      

       

    }

The output as Shows Below after selecting one item

When user wants to remove selected Item From Second ListBox use the Below code in Remove Button.It removes only one selected Item

    protected void Remove_Click(object sender, EventArgs e)

    {

        try

        {

        if (ListBox2.Items.Count >= 1)

        {

            if (ListBox2.SelectedValue != null)

            {

                string selecteditem2 = ListBox2.SelectedItem.Text;

                ListBox2.Items.Remove(selecteditem2);

 

            }                  

        }

        else

        {

            Response.Write("No ITEMS Found");

        }

        }

 

        catch ( Exception e1)

        {

 

        }

             

    }

 

write Below code in SelectAll button when user wants to select all Items at a Time and transer to second ListBox.

    protected void SelectAll_Click(object sender, EventArgs e)

    {

        ListBox2.Items.Clear();

        for (int i = 0; i < ListBox1.Items.Count; i++)

        {

 

            ListItem li = new ListItem();

            li.Text = ListBox1.Items[i].Text;

            li.Value = ListBox1.Items[i].Value;

            ListBox2.Items.Add(li);

 

 

        }

    }

The outPut of SelectAll will displays a Below:

When the user wants to DeSelect (or) Remove all Items from second ListBox write the below code in RemoveAll Button:

protected void RemoveAll_Click(object sender, EventArgs e)

    {

        ListBox2.Items.Clear();

    }

Above Clear() will  remove all Items from a ListBox at a Time.


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