Run time Error

mustish1
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Can you please help me in that error?
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namespace InsertUpdateDel
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.txtID = new System.Windows.Forms.TextBox();
            this.txtName = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.listBox2 = new System.Windows.Forms.ListBox();
            this.label3 = new System.Windows.Forms.Label();
            this.label4 = new System.Windows.Forms.Label();
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.SuspendLayout();
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(59, 47);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(19, 13);
            this.label1.TabIndex = 0;
            this.label1.Text = "Id.";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(59, 95);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(35, 13);
            this.label2.TabIndex = 1;
            this.label2.Text = "Name";
            // 
            // txtID
            // 
            this.txtID.Location = new System.Drawing.Point(149, 47);
            this.txtID.Name = "txtID";
            this.txtID.Size = new System.Drawing.Size(100, 20);
            this.txtID.TabIndex = 2;
            // 
            // txtName
            // 
            this.txtName.Location = new System.Drawing.Point(149, 95);
            this.txtName.Name = "txtName";
            this.txtName.Size = new System.Drawing.Size(100, 20);
            this.txtName.TabIndex = 3;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(149, 145);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 4;
            this.button1.Text = "Insert";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // listBox2
            // 
            this.listBox2.FormattingEnabled = true;
            this.listBox2.Location = new System.Drawing.Point(479, 47);
            this.listBox2.Name = "listBox2";
            this.listBox2.Size = new System.Drawing.Size(138, 160);
            this.listBox2.TabIndex = 6;
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(335, 19);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(16, 13);
            this.label3.TabIndex = 7;
            this.label3.Text = "Id";
            // 
            // label4
            // 
            this.label4.AutoSize = true;
            this.label4.Location = new System.Drawing.Point(524, 19);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(35, 13);
            this.label4.TabIndex = 8;
            this.label4.Text = "Name";
            // 
            // listBox1
            // 
            this.listBox1.FormattingEnabled = true;
            this.listBox1.Location = new System.Drawing.Point(318, 47);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(133, 160);
            this.listBox1.TabIndex = 9;
            this.listBox1.SelectedIndexChanged += new System.EventHandler(this.listBox1_SelectedIndexChanged);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(906, 314);
            this.Controls.Add(this.listBox1);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.listBox2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.txtName);
            this.Controls.Add(this.txtID);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Name = "Form1";
            this.Text = "Insert Update Delete";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox txtID;
        private System.Windows.Forms.TextBox txtName;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.ListBox listBox2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.ListBox listBox1;
    }
}

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

namespace InsertUpdateDel
{
    public partial class Form1 : Form
    {
        SqlConnection cn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Lenovo\Documents\Visual Studio 2012\Projects\InsertUpdateDel\InsertUpdateDel\Database1.mdf;Integrated Security=True;User Instance=True");
        SqlCommand cmd = new SqlCommand();
        SqlDataReader sd;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
                cmd.Connection = cn;
                loadlist();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (txtID.Text != "" & txtName.Text != "")
            {
                cn.Open();
                cmd.CommandText = "Insert into info(id, name) values ('" +txtID.Text+"', '" +txtName.Text+"')";
                cmd.ExecuteNonQuery();
                cmd.Clone();
                MessageBox.Show("Record Inserted", "Programming");
                cn.Close();
                txtID.Text="";
                txtName.Text="";
                loadlist();
            }
        }
        private void loadlist()
        {
            listBox1.Items.Clear();
            listBox2.Items.Clear();
            cn.Open();
            cmd.CommandText = "select * from info";
            sd = cmd.ExecuteReader();
            if (sd.HasRows)
            {
                while (sd.Read())
                {
                    listBox1.Items.Add(sd[0].ToString());
                    listBox2.Items.Add(sd[0].ToString());
                }
        }
        cn.Close();
        }

        private void listBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            ListBox i = sender as ListBox;
            if (i.SelectedIndex != -1)
            {
                listBox1.SelectedIndex = i.SelectedIndex;
                listBox2.SelectedIndex = i.SelectedIndex;
        }
        
        }
    }
}

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Lead Software Engineer
Commented:
You have a method for listBox2_SelectedIndexChanged but not listBox1_SelectedIndexChanged.

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