how to compare two listbox items and add to anthor combo box which are common in listboxes

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2.00/5 (1 vote)

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I am new to C#. I have two `ListBoxes`

1 listbox --> lbFirstTableColumns
2 listbox --> lbSecondTableColumns
combo Box --> cmbJoinColumn

now I want compare two `ListBox` items and add to `cmbJoinColumn` which are common in my `Listboxes`

I have tried following code but it doesn't give any result

public void AddJoinColumns()
{
try
{
List<string> lstArray = new List<string>();
//add each items to lstarray
for (int index = 0; index < lbFirstTableColumns.Items.Count; index++)
{
lstArray.Add(lbFirstTableColumns.Items[index].ToString());
}
//compare each listarray item in second listbox if any matching copy into combo box
foreach (string str in lstArray)
{
MessageBox.Show(str);
if (lbSecondTableColumns.Items.Contains(str))
{
cmbJoinColumn.Items.Add(str);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}

Posted 15-Nov-12 17:34pm

Ranga Sathish

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2 solutions

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Dineshshp · Answer 1 · 2012-11-15T18:15:00

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void bttnAdd_Click(object sender, EventArgs e)
        {
            for (int __k = 0; __k < lst_1.Items.Count; __k++)
            {
                if (lst_2.Items.Contains(lst_1.Items[__k]))
                    cbo.Items.Add(lst_1.Items[__k]);
            }
        }
    }
}

DamithSL · Answer 2 · 2012-11-15T18:51:00

Solution 2

by using System.Linq

C#

var list1 = lbFirstTableColumns.Items.Cast<string>();
var list2 = lbSecondTableColumns.Items.Cast<string>();


cbo.DataSource = list1.Intersect(list2);

Posted 15-Nov-12 18:51pm

DamithSL

Updated 15-Nov-12 18:56pm

v2

Comments

Member 9975733 20-Dec-13 12:39pm

Please code for C# Web application