C# 在winform中查找控件

/// <summary>
/// 在winform中查找控件
/// </summary>
/// <param ></param>
/// <param ></param>
/// <returns></returns>
private System.Windows.Forms.Control findControl(System.Windows.Forms.Control control, string controlName)
{
Control c1;
foreach (Control c in control.Controls)
{
if (c.Name == controlName)
{
return c;
}
else if (c.Controls.Count > 0)
{
c1 = findControl(c, controlName);
if (c1 != null)
{
return c1;
}
}
}
return null;
}

//调用

for (int i = 1; i <= 30; i++)
{
string _box = "b" + i.ToString();
TextBox tb = (TextBox)this.findControl(groupBox2, _box);
tb.Text = i.ToString();
}