[C#]Set Windows 7 Progress Bar's State

    #region DllImport
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    internal static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam); 
    #endregion

    #region Private Method
    void SetPaused(ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_PAUSE, 0);
    }

    void SetError(ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_ERROR, 0);
    }

    void SetNormal(ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_NORMAL, 0);
    } 
    #endregion</pre></div>

namespace WindowsFormsApplication3 { public partial class Form1 : Form { #region Const const int PBM_SETPOS = 0x402; const int PBM_GETPOS = 0x0408; const int PBM_SETSTATE = 0x410; const int PBST_PAUSE = 0x0003; const int PBST_ERROR = 0x0002; const int PBST_NORMAL = 0x0001; #endregion

    #region DllImport
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    internal static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam); 
    #endregion

    #region Private Method
    void SetPaused(ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_PAUSE, 0);
    }

    void SetError(ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_ERROR, 0);
    }

    void SetNormal(ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_NORMAL, 0);
    } 
    #endregion

    public Form1()
    {
        InitializeComponent();
    }

    private void trackBar1_Scroll(object sender, EventArgs e)
    {
        SendMessage(progressBar1.Handle, PBM_SETPOS, trackBar1.Value, 0);
    }

    private void button1_Click(object sender, EventArgs e)
    {
        SetNormal(progressBar1);
    }

    private void button2_Click(object sender, EventArgs e)
    {
        SetPaused(progressBar1);
    }

    private void button3_Click(object sender, EventArgs e)
    {
        SetError(progressBar1);
    }
}

}

    #region DllImport
    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    internal static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);
    #endregion

    #region Public Method
    public static void SetNormalState(this ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_NORMAL, 0);
    }

    public static void SetPauseState(this ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_PAUSE, 0);
    }

    public static void SetErrorState(this ProgressBar progressBar)
    {
        SendMessage(progressBar.Handle, PBM_SETSTATE, PBST_ERROR, 0);
    } 
    #endregion
}</pre></div>

    private void trackBar1_Scroll(object sender, EventArgs e)
    {
        progressBar1.Value = trackBar1.Value;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        progressBar1.SetNormalState();
    }

    private void button2_Click(object sender, EventArgs e)
    {
        progressBar1.SetPauseState();
    }

    private void button3_Click(object sender, EventArgs e)
    {
        progressBar1.SetErrorState();
    }
}</pre></div>

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