Introduction :
This code will show how
to use ListBox to Select/Filter items :
Design Code :
<div style="width: 100%; float: left;">
<div style="width: 25%; float: left; margin-top: 10px;">
<asp:ListBox ID="ListBox1" runat="server" Height="150px" Width="98%" 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>
</div>
<div style="width: 8%; float: left; margin: 10px;">
<asp:Button ID="btn01" runat="server" OnClick="btn01_Click" Text=">" Style="margin: 3px 14px;" />
<asp:Button ID="Button2" runat="server" OnClick="Button1_Click" Text=">>" Style="margin: 3px 14px;" />
<asp:Button ID="Button3" runat="server" OnClick="Button2_Click" Text="<" Style="margin: 3px 14px;" />
<asp:Button ID="Button4" runat="server" OnClick="Button3_Click" Text="<<" Style="margin: 3px 14px;" />
</div>
<div style="width: 25%; float: left; margin-top: 10px;">
<asp:ListBox ID="ListBox2" runat="server" Height="150px" Width="98%" SelectionMode="Multiple"></asp:ListBox>
</div>
<asp:Label ID="lbltxt" runat="server" ForeColor="Red"></asp:Label>
</div>
Code Behind :
ArrayList arraylist1 = new ArrayList();
ArrayList arraylist2 = new ArrayList();
protected void btn01_Click(object sender, EventArgs e)
{
lbltxt.Visible = false;
if (ListBox1.SelectedIndex >= 0)
{
for (int i = 0; i < ListBox1.Items.Count; i++)
{
if (ListBox1.Items[i].Selected)
{
if
(!arraylist1.Contains(ListBox1.Items[i]))
{
arraylist1.Add(ListBox1.Items[i]);
}
}
}
for (int i = 0; i < arraylist1.Count; i++)
{
if (!ListBox2.Items.Contains(((ListItem)arraylist1[i])))
{
ListBox2.Items.Add(((ListItem)arraylist1[i]));
}
ListBox1.Items.Remove(((ListItem)arraylist1[i]));
}
ListBox2.SelectedIndex = -1;
}
else
{
lbltxt.Visible = true;
lbltxt.Text = "Please select atleast one in Listbox1 to move";
}
}
protected void Button1_Click(object sender, EventArgs e)
{
lbltxt.Visible = false;
while (ListBox1.Items.Count != 0)
{
for (int i = 0; i < ListBox1.Items.Count; i++)
{
ListBox2.Items.Add(ListBox1.Items[i]);
ListBox1.Items.Remove(ListBox1.Items[i]);
}
}
}
protected void Button2_Click(object sender, EventArgs e)
{
lbltxt.Visible = false;
if (ListBox2.SelectedIndex >= 0)
{
for (int i = 0; i < ListBox2.Items.Count; i++)
{
if (ListBox2.Items[i].Selected)
{
if
(!arraylist2.Contains(ListBox2.Items[i]))
{
arraylist2.Add(ListBox2.Items[i]);
}
}
}
for (int i = 0; i < arraylist2.Count; i++)
{
if (!ListBox1.Items.Contains(((ListItem)arraylist2[i])))
{
ListBox1.Items.Add(((ListItem)arraylist2[i]));
}
ListBox2.Items.Remove(((ListItem)arraylist2[i]));
}
ListBox1.SelectedIndex = -1;
}
else
{
lbltxt.Visible = true;
lbltxt.Text = "Please select atleast one in Listbox2 to move";
}
}
protected void Button3_Click(object sender, EventArgs e)
{
lbltxt.Visible = false;
while (ListBox2.Items.Count != 0)
{
for (int i = 0; i < ListBox2.Items.Count; i++)
{
ListBox1.Items.Add(ListBox2.Items[i]);
ListBox2.Items.Remove(ListBox2.Items[i]);
}
}
}
