How do I move multiple selections from one ListBox to another?

I have two listboxes. The first is populated from an SQL table. I am trying to allow the user to select mutiple entried from the first box and move them to the second. I tried using the code below (which works fine when selecting a single item from the listbox) in the loop but it still selects only the first item and adds it for each selection I make. (ie. If I select statute 12345, 12346 and 12347 it adds 12345 3 times to the other listbox).

private void btnAddStat_Click(object sender, EventArgs e)
{
foreach (var item in lstStatutes.SelectedItems)
{
DataRowView drvStatute = lstStatutes.SelectedItem as DataRowView;
string stat = string.Empty;
if (drvStatute != null)
{
stat = drvStatute.Row["Statute"] as string;
lstSelStatutes.Items.Add(stat);
}
}
}

Hello Scott G, refer below code sample,

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Listbox Sampletitle>
head>
<body>
<form id="form1" runat="server">
<div>
<table align="center">
<tr>
<td align="center" colspan="3">
<b>ListBox Sampleb>
td>
tr>
<tr>
<td>
<asp:ListBox ID="ListBox1" runat="server" Height="169px" Width="121px" SelectionMode="Multiple">
<asp:listitem Value="0">Asp.Netasp:listitem>
<asp:listitem Value="1">C#.Netasp:listitem>
<asp:listitem Value="2">VB.Netasp:listitem>
<asp:listitem Value="3">JavaScriptasp:listitem>
<asp:listitem Value="4">Ajaxasp:listitem>
asp:ListBox>
td>
<td>
<table>
<tr>
<td>
<asp:Button ID="btn1" runat="server" Text=">" Width="45px" onclick="btn1_Click" />
td>
tr>
<tr>
<td>
<asp:Button ID="btn2" runat="server" Text=">>" Width="45px" onclick="btn2_Click" />
td>
tr>
<tr>
<td>
<asp:Button ID="btn3" runat="server" Text="<" Width="45px" onclick="btn3_Click" />
td>
tr>
<tr>
<td>
<asp:Button ID="btn4" runat="server" Text="<<" Width="45px" onclick="btn4_Click" />
td>
tr>
table>
td>
<td>
<asp:ListBox ID="ListBox2" runat="server" Height="169px" Width="121px" SelectionMode="Multiple">
<asp:listitem Value="0">SQl Serverasp:listitem>
<asp:listitem Value="1">Sharesointasp:listitem>
<asp:listitem Value="2">Jqueryasp:listitem>
asp:ListBox>
td>
tr>
<tr>
<td colspan="3">
<asp:Label ID="lbltxt" runat="server" ForeColor="Red">asp:Label>
td>
tr>
table>
div>
form>
body>
html>

c# code:

using System.Collections;
ArrayList arraylist1 = new ArrayList();
ArrayList arraylist2 = new ArrayList();
protected void Page_Load(object sender, EventArgs e)
{
}
///
/// btn1_Click event is used to move single or multiple items from Listbox1 to Listbox2
///
///
///
protected void btn1_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";
}
}
///
/// btn2_Click event is used to move all items from Listbox1 to Listbox2
///
///
///
protected void btn2_Click(object sender, EventArgs e)
{
lbltxt.Visible = false;
while(ListBox1.Items.Count!=0)
{
for(int i=0;i
{
ListBox2.Items.Add(ListBox1.Items[i]);
ListBox1.Items.Remove(ListBox1.Items[i]);
}
}
}
///
/// btn3_Click event is used to move single or multiple items from Listbox2 to Listbox1
///
///
///
protected void btn3_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";
}
}
///
/// btn4_Click event is used to move all items form Listbox2 to Listbox1
///
///
///
protected void btn4_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]);
}
}
}
}

2 Replies

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Rajanikant Hawaldar6y ago
Hello Scott G, refer below code sample,
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Listbox Sampletitle>
head>
<body>
<form id="form1" runat="server">
<div>
<table align="center">
<tr>
<td align="center" colspan="3">
<b>ListBox Sampleb>
td>
tr>
<tr>
<td>
<asp:ListBox ID="ListBox1" runat="server" Height="169px" Width="121px" SelectionMode="Multiple">
<asp:listitem Value="0">Asp.Netasp:listitem>
<asp:listitem Value="1">C#.Netasp:listitem>
<asp:listitem Value="2">VB.Netasp:listitem>
<asp:listitem Value="3">JavaScriptasp:listitem>
<asp:listitem Value="4">Ajaxasp:listitem>
asp:ListBox>

td>
<td>
<table>
<tr>
<td>
<asp:Button ID="btn1" runat="server" Text=">" Width="45px" onclick="btn1_Click" />
td>
tr>
<tr>
<td>
<asp:Button ID="btn2" runat="server" Text=">>" Width="45px" onclick="btn2_Click" />
td>
tr>
<tr>
<td>
<asp:Button ID="btn3" runat="server" Text="<" Width="45px" onclick="btn3_Click" />
td>
tr>
<tr>
<td>
<asp:Button ID="btn4" runat="server" Text="<<" Width="45px" onclick="btn4_Click" />
td>
tr>
table>
td>
<td>
<asp:ListBox ID="ListBox2" runat="server" Height="169px" Width="121px"  SelectionMode="Multiple">
<asp:listitem Value="0">SQl Serverasp:listitem>
<asp:listitem Value="1">Sharesointasp:listitem>
<asp:listitem Value="2">Jqueryasp:listitem>
asp:ListBox>
td>
tr>
<tr>
<td colspan="3">
<asp:Label ID="lbltxt" runat="server" ForeColor="Red">asp:Label>
td>
tr>
table>
div>
form>
body>
html>
c# code:
using System.Collections;
ArrayList arraylist1 = new ArrayList();
ArrayList arraylist2 = new ArrayList();
protected void Page_Load(object sender, EventArgs e)
{

}
///

/// btn1_Click event is used to move single or multiple items from Listbox1 to Listbox2
///
///
///
protected void btn1_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";
}
}
///

/// btn2_Click event is used to move all items from Listbox1 to Listbox2
///
///
///
protected void btn2_Click(object sender, EventArgs e)
{
lbltxt.Visible = false;
while(ListBox1.Items.Count!=0)
{
for(int i=0;i
{
ListBox2.Items.Add(ListBox1.Items[i]);
ListBox1.Items.Remove(ListBox1.Items[i]);
}
}
}
///

/// btn3_Click event is used to move single or multiple items from Listbox2 to Listbox1
///
///
///
protected void btn3_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";
}
}
///

/// btn4_Click event is used to move all items form Listbox2 to Listbox1
///
///
///
protected void btn4_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]);
}
}
}
}
Farhan Ahmed6y ago
https://www.aspsnippets.com/Articles/Move-ListBox-Items-from-one-ListBox-to-another-in-ASPNet-using-C-and-VBNet.aspx#:~:text=Moving%20ListBox%20Items%20from%20one,removed%20from%20the%20Right%20ListBox.

https://www.c-sharpcorner.com/UploadFile/009464/move-data-from-one-listbox-to-other-listbox-in-Asp-Net359/

https://www.aspdotnet-suresh.com/2010/12/how-to-move-listitems-from-one-listbox.html