我有c#上传图像，但我希望它激活网络摄像头和捕获，而不是上传

我是c#新手。我想用网络摄像头捕捉图像，而不是上传图像功能。这是我上传图片的代码。

注意:

"MyQuery" is my class name. Then conn is my connection declared inside my "MyQuery" class name. 

这是我的上传图像当按钮是触发器

private void button1_Click(object sender, EventArgs e){
    MyQuery capture = new MyQuery();
        capture.Connection();
        OpenFileDialog fp = new OpenFileDialog();
        fp.InitialDirectory = @"";
        fp.Filter = "[JPG,JPEG]|*.jpg";
        if (fp.ShowDialog() == DialogResult.OK)
        {
            this.pictureBox1.Image = Image.FromFile(fp.FileName);
            this.pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
            this.pictureBox1.Refresh();
        }
        MySqlCommand cmd = new MySqlCommand("Insert into MyImage (ImgFiled) values('" + this.pictureBox1.Image + "')",capture.conn);
        cmd.ExecuteNonQuery();
        MessageBox.Show("Successfully Uploaded");
}