Clear ListBox
Add item to ListBox
Remove Single and Multiple Items From Listbox
Check Items Existed or Not in ListBox
lstAdd is Listbox id
txtAdd is textbox Id
ListBox2.Items.Clear()
Add item to ListBox
protected void btnAdd_Click(object sender, EventArgs e)
{
if (lstAdd.Items.FindByText(txtAdd.Text) == null)
{
lstAdd.Items.Add(txtAdd.Text);
}
else
{
Response.Write("<script>alert('Already
Existed.......!')</script>");
}
}
Remove Single and Multiple Items From Listbox
<body>
<form id="form1" runat="server">
<div>
<asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
<asp:ListItem>A</asp:ListItem>
<asp:ListItem>B</asp:ListItem>
<asp:ListItem>C</asp:ListItem>
<asp:ListItem>D</asp:ListItem>
<asp:ListItem>E</asp:ListItem>
<asp:ListItem>F</asp:ListItem>
</asp:ListBox>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="DELETE" />
</div>
</form>
</body>
C# CODE
protected void Button1_Click(object sender, EventArgs e)
{
int SelItemCount = ListBox1.Items.Count; // COUNT TOTAL ITEMS COUNT
for (int i = 0; i < SelItemCount; i++)
{
ListBox1.Items.Remove(ListBox1.SelectedItem);
}
}
Check Items Existed or Not in ListBox
lstAdd is Listbox id
txtAdd is textbox Id
protected void btnAdd_Click(object sender, EventArgs e)
{
if (lstAdd.Items.FindByText( txtAdd.Text) != null)
{
Response.Write("<script>alert('Already
Existed.......!')</script>");
}
}
Add items manually.....
lstAdd.Items.Add("Tokyo");
Insert the string or object at the desired point in the list with the Insert method:
lstAdd.Items.Insert(0, "Copenhagen");
// To remove item with index 0:
lstAdd.Items.RemoveAt(0);
// To remove "Tokyo" item:
lstAdd.Items.Remove("Tokyo");
Add items manually.....
lstAdd.Items.Add("Tokyo");
Insert the string or object at the desired point in the list with the Insert method:
lstAdd.Items.Insert(0, "Copenhagen");
// To remove item with index 0:
lstAdd.Items.RemoveAt(0);
// To remove "Tokyo" item:
lstAdd.Items.Remove("Tokyo");
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