动态生成控件后，怎样才能修改其属性，

private void Form1_Load(object sender, System.EventArgs e)
{
Button b=new Button();
b.Name="3434";
b.Width=200;
b.Text="ewrwer";
this.Controls.Add(b);
} private void button1_Click(object sender, System.EventArgs e)
{
foreach(System.Windows.Forms.Control c in this.Controls)
{
if(c.Name=="3434")
MessageBox.Show("setert");
} }