Jeg får en run time error når jeg kører en dropdownlist

Show us your code :)

using System.Data.SqlClient;
using System.Windows.Forms;
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.OleDb;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace matrixwin32app
{
    /// <summary>
    /// Summary description for Form1.
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.ComboBox DropDownList1;
        private System.Windows.Forms.Label Label28;
        private System.Windows.Forms.TextBox TextBox7;
        private System.Windows.Forms.Button Button2;
        private System.Windows.Forms.Label Label3;
        private System.Windows.Forms.Label Label2;
        private System.Windows.Forms.TextBox TextBox2;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (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.DropDownList1 = new System.Windows.Forms.ComboBox();
            this.Label28 = new System.Windows.Forms.Label();
            this.TextBox7 = new System.Windows.Forms.TextBox();
            this.Button2 = new System.Windows.Forms.Button();
            this.Label3 = new System.Windows.Forms.Label();
            this.Label2 = new System.Windows.Forms.Label();
            this.TextBox2 = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            //
            // DropDownList1
            //
            this.DropDownList1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.DropDownList1.Location = new System.Drawing.Point(24, 32);
            this.DropDownList1.Name = "DropDownList1";
            this.DropDownList1.Size = new System.Drawing.Size(121, 21);
            this.DropDownList1.TabIndex = 0;
            this.DropDownList1.SelectedIndexChanged += new System.EventHandler(this.DropDownList1_SelectedIndexChanged);
            //
            // Label28
            //
            this.Label28.Location = new System.Drawing.Point(232, 24);
            this.Label28.Name = "Label28";
            this.Label28.Size = new System.Drawing.Size(240, 144);
            this.Label28.TabIndex = 1;
            this.Label28.Text = "Til fejlmeddelse";
            //
            // TextBox7
            //
            this.TextBox7.Location = new System.Drawing.Point(24, 112);
            this.TextBox7.Name = "TextBox7";
            this.TextBox7.ScrollBars = System.Windows.Forms.ScrollBars.Horizontal;
            this.TextBox7.TabIndex = 2;
            this.TextBox7.Text = "textBox1";
            //
            // Button2
            //
            this.Button2.Location = new System.Drawing.Point(120, 280);
            this.Button2.Name = "Button2";
            this.Button2.TabIndex = 4;
            this.Button2.Text = "Button2";
            this.Button2.Click += new System.EventHandler(this.Button2_Click);
            //
            // Label3
            //
            this.Label3.Location = new System.Drawing.Point(336, 240);
            this.Label3.Name = "Label3";
            this.Label3.TabIndex = 5;
            this.Label3.Text = "label3";
            //
            // Label2
            //
            this.Label2.Location = new System.Drawing.Point(336, 208);
            this.Label2.Name = "Label2";
            this.Label2.TabIndex = 6;
            this.Label2.Text = "label2";
            //
            // TextBox2
            //
            this.TextBox2.Location = new System.Drawing.Point(24, 160);
            this.TextBox2.Name = "TextBox2";
            this.TextBox2.TabIndex = 7;
            this.TextBox2.Text = "textBox2";
            //
            // Form1
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(488, 334);
            this.Controls.Add(this.TextBox2);
            this.Controls.Add(this.Label2);
            this.Controls.Add(this.Label3);
            this.Controls.Add(this.Button2);
            this.Controls.Add(this.TextBox7);
            this.Controls.Add(this.Label28);
            this.Controls.Add(this.DropDownList1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);

        }
        #endregion

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
            string cS = "provider=Microsoft.JET.OLEDB.4.0; "
                + "data source = C:\\Documents and Settings\\kj\\My Documents\\Visual Studio Projects\\matrixwin32app\\matrix.mdb";
            string scS = "Select * from areatabel;";
            DropDownList1.Items.Clear();
            ListItem l = new ListItem("No area is selected", "0");
            DropDownList1.Items.Add(l);
            try
            {
                OleDbConnection areCnx = new OleDbConnection(cS);
                areCnx.Open();
                OleDbDataAdapter areAdapter = new OleDbDataAdapter(scS,areCnx);
                DataSet areDataset = new DataSet();
                areAdapter.Fill(areDataset, "Area");
                DataTable areDatatable = areDataset.Tables["Area"];
                foreach(DataRow t in areDatatable.Rows)
                {
                    string t1 = (string)t["area_navn"];
                    int t2 = (int)t["area_nummer"];
                    ListItem s = new ListItem(t1, t2.ToString());
                    DropDownList1.Items.Add(s);
                }
                areCnx.Close();
            }
            catch(Exception ex)
            {
                Label28.Text = ex.ToString();
            }
        }
        private void slet()
        {
            TextBox7.Text = "";
            Label28.Text = "";
        }
        private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            Button2.Visible = true;
            string connectionString = "provider=Microsoft.JET.OLEDB.4.0; "
                + "data source = C:\\Documents and Settings\\kj\\My Documents\\Visual Studio Projects\\matrixwin32app\\matrix.mdb";
            string commandString3 =    "select * from areatabel where area_nummer ="+
                DropDownList1.SelectedItem+";";
            Label3.Text=DropDownList1.SelectedItem.ToString();
            OleDbDataAdapter  dataAdapter3 =
                new OleDbDataAdapter (commandString3, connectionString);
            DataSet dataSet3 = new DataSet();
           
            dataAdapter3.Fill(dataSet3,"area");
            DataTable dataTable3 = dataSet3.Tables["area"];
            foreach (DataRow dataRow in dataTable3.Rows)
            {
                Label2.Text=(dataRow["area_nummer"].ToString());
            }
            Label3.Text=DropDownList1.SelectedItem.ToString();
        }
        private void Button2_Click(object sender, System.EventArgs e)
        {
       
        }
    }
}

i den her string viser den, den tekst der er i dropdownlisten, og ikke det tal der er hentet fra database. Hvis det kan hjælpe

    string commandString3 =    "select * from areatabel where area_nummer ="+
                DropDownList1.SelectedItem+";";

Jeg har lige besøgt dit forum dotnetforum.dk, det ser ret godt ud. jeg har tidligere spurgt om en der kunne hjælpe mig med noget kode til at login med. altså brugernavn og password. Det har du jo på din side kan du hjælpe mig med det?

Kan du finde ud af det? Ellers spørg hvis der er noget du er i tvivl om!!

Hvis du er igang, eller ikke er igang kan du så ikke lige sige det så jeg ikke sidder og venter!!!!

Tak for hjælpen, og tak for du svarer

Ok hvor blev du af??

Lukker spm