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Practical-11

Problem Statement​

Write a program to Delete Items from Dropdown list and List box.

Solution​

To delete items from a Dropdown list and List box in ASP.NET, follow the steps below:

  1. Create a new ASP.NET Web Application project in Visual Studio.
  2. Add a new Web Form to the project by right-clicking on the project in the Solution Explorer, selecting "Add" > "Web Form".
  3. Rename the Web Form to "Default.aspx".
  4. Open the "Default.aspx" file and design the user interface as per your requirements using HTML and ASP.NET controls.
  5. Add the following controls to the "Default.aspx" form:
    • DropDownList control: <asp:DropDownList ID="ddlItems" runat="server"></asp:DropDownList>
    • ListBox control: <asp:ListBox ID="lstItems" runat="server"></asp:ListBox>
    • Button control: <asp:Button ID="btnDelete" runat="server" Text="Delete" OnClick="btnDelete_Click"></asp:Button>
  6. In the code-behind file, write the following code in the Page_Load event handler to populate the DropDownList and ListBox controls:
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ddlItems.Items.Add(new ListItem("Item 1", "1"));
        ddlItems.Items.Add(new ListItem("Item 2", "2"));
        ddlItems.Items.Add(new ListItem("Item 3", "3"));

        lstItems.Items.Add(new ListItem("Item 1", "1"));
        lstItems.Items.Add(new ListItem("Item 2", "2"));
        lstItems.Items.Add(new ListItem("Item 3", "3"));
    }
}
  1. Write the following code in the click event handler of the "btnDelete" button to delete the selected item from the DropDownList and ListBox controls:
protected void btnDelete_Click(object sender, EventArgs e)
{
    if (ddlItems.SelectedIndex != -1)
    {
        ddlItems.Items.RemoveAt(ddlItems.SelectedIndex);
    }

    if (lstItems.SelectedIndex != -1)
    {
        lstItems.Items.RemoveAt(lstItems.SelectedIndex);
    }
}
  1. Build and run the application to see the functionality of deleting items from the controls.

This completes the solution for deleting items from a Dropdown list and List box in ASP.NET.