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

namespace MP3
{
    public class MP3Player
    {
        private string _Alias;

        public MP3Player(string pAlias)
        {
            this._Alias = pAlias;
        }

        public bool Play(string pFileName)
        {
            bool ret = false;
            StringBuilder retApi = new StringBuilder(new string(' ', 256));
            if (GetShortPathName(pFileName, retApi, retApi.Length) > 0)
            {
                //MCI öffnen
                int intMciResult = mciSendString(string.Format("open {0} type MPEGVideo alias {1}", retApi.ToString(), this._Alias), string.Empty, 0, IntPtr.Zero);

                int intPlayResult = -1;
                if (intMciResult == 0)
                {
                    //MP3 Play
                    intPlayResult = mciSendString(string.Format("play {0} from 0", this._Alias), string.Empty, 0, IntPtr.Zero);
                }

                ret = intPlayResult == 0;
            }
            return ret;
        }

        public bool Stop()
        {
            bool ret = false;
            if (mciSendString(string.Format("stop {0}", this._Alias), string.Empty, 0, IntPtr.Zero) == 0)
            {
                ret = mciSendString(string.Format("close {0}", this._Alias), string.Empty, 0, IntPtr.Zero) == 0;
            }
            return ret;
        }
        [DllImport("winmm.dll")]
        private static extern int mciSendString(string lpCommand, string lpReturn, int nReturnLength, IntPtr callBack);

        [DllImport("kernel32")]
        private static extern int GetShortPathName(string lpLongPath, StringBuilder lpShortPath, int Buffer);
    }
}

namespace DeviceApplication13
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        MP3.MP3Player _M = new MP3.MP3Player("myPlayer");
        private void button1_Click(object sender, System.EventArgs e)
        {
            this._M.Play(@"\Storage Card\test.mp3");
            
        }
    }
}					

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"DeviceApplication14.Form1.Dispose(bool)": Es wurde keine passende Methode zum Überschreiben gefunden.					

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namespace DeviceApplication14
{
    partial class Form1
    {
        /// <summary>
        /// Erforderliche Designervariable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
        private System.Windows.Forms.MainMenu mainMenu1;

        /// <summary>
        /// Verwendete Ressourcen bereinigen.
        /// </summary>
        /// <param name="disposing">True, wenn verwaltete Ressourcen gelöscht werden sollen; andernfalls False.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Vom Windows Form-Designer generierter Code

        /// <summary>
        /// Erforderliche Methode für die Designerunterstützung.
        /// Der Inhalt der Methode darf nicht mit dem Code-Editor geändert werden.
        /// </summary>
        private void InitializeComponent()
        {
            this.mainMenu1 = new System.Windows.Forms.MainMenu();
            this.button1 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(24, 48);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(72, 20);
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;
            this.AutoScroll = true;
            this.ClientSize = new System.Drawing.Size(638, 455);
            this.Controls.Add(this.button1);
            this.Menu = this.mainMenu1;
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.Button button1;
    }
}