How to use Clear, Remove and RemoveAt in DropDownList in ASP.Net

Here in this ASP.NET Example of DropDownList Control we will learn to use Clear(), Remove() and RemoveAt() method in ASP.Net with C# Programmatically.

First we design the ASP.Net web page with One DropDownList Control and Three Button Control.

The HTML Code for asp.net web page is:

<table>
<tr>
<td style=”width: 100px; text-align: right”>
Select Value :</td>
<td style=”width: 100px; text-align: left”>
<asp:DropDownList ID=”Drpvalue” runat=”server”
Width=”128px”>
<asp:ListItem Value=”0″>SELECT</asp:ListItem>
<asp:ListItem Value=”Meera”>Meera</asp:ListItem>
<asp:ListItem Value=”Academy”>Academy</asp:ListItem>
<asp:ListItem Value=”ASP”>ASP</asp:ListItem>
<asp:ListItem Value=”PHP”>PHP</asp:ListItem>
<asp:ListItem Value=”SQL”>SQL</asp:ListItem>
</asp:DropDownList></td>
<td style=”width: 100px; text-align: left”>
</td>
</tr>
<tr>
<td style=”width: 100px; text-align: right”>
<asp:Button ID=”Button1″ runat=”server” OnClick=”Button1_Click” Text=”CLEAR” /></td>
<td style=”width: 100px”>
<asp:Button ID=”Button2″ runat=”server” OnClick=”Button2_Click” Text=”REMOVE” /></td>
<td style=”width: 100px; text-align: left”>
<asp:Button ID=”Button3″ runat=”server” OnClick=”Button3_Click” Text=”REMOVE AT” /></td>
</tr>
<tr>
<td colspan=”3″ style=”text-align: center”>
<asp:Label ID=”Label1″ runat=”server” Font-Bold=”True” ForeColor=”Purple”></asp:Label></td>
</tr>
</table>

The Design output of SAP.Net Example is:

Use Clear() in DropdownList control in ASP.Net

write the below code on CLEAR Button for clear all the items from DropDownList.

 protected void Button1_Click(object sender, EventArgs e)
{
Drpvalue.Items.Clear();
Label1.Text = “All Items Clear !”;
}

The ASP.NET DropDownList Control Clear() Method output is:

Now, For Remove a Item write below code on REMOVE Button Click Event:

protected void Button2_Click(object sender, EventArgs e)
{
Drpvalue.Items.Remove(“ASP”);
Label1.Text = “‘ASP’ Removed Successfully”;
}

The ASP.Net DropDownList Control Remove method output is:

Write Below code on ClearAt Button for Clear Item from particular Index in ASP.Net.

protected void Button3_Click(object sender, EventArgs e)
{
Drpvalue.Items.RemoveAt(2);
Label1.Text = “Item Removed from Position 2 !”;
}

The ASP.NET DropDownList control RemoveAt method output is:

I hope this asp.net CLear(), Remove() and RemoveAt() Method of DropDownList control will help you….