private void Form1_Load(object sender, EventArgs e)
        {
            button1.Click += new EventHandler(ChangeColors_Click);
         }

    void ChangeColors_Click(object sender, EventArgs e)
        {
            ToolStripManager.Renderer =
                new ToolStripProfessionalRenderer(new MyProfessionalColors());
        }


 private void button1_Click(object sender, EventArgs e)
        {
             // Create a control called ToolStrip.
            ToolStrip ts = new ToolStrip();
            ts.Items.Add("Veera");
            ts.Items.Add("Siju");
            ts.Items.Add("Rahul Manikam");
            // i am adding the toolstrip into form
            this.Controls.Add(ts);
         }

class MyProfessionalColors : ProfessionalColorTable
    {
        public override Color ToolStripGradientBegin
        { get { return Color.GreenYellow; } }

        public override Color ToolStripGradientMiddle
        { get { return Color.CadetBlue; } }

        public override Color ToolStripGradientEnd
        { get { return Color.CornflowerBlue; } }
    }