string[] labelNames = { "label11", "label12", "label13", "label14", "label15", "label16", "label17", "label18", "label19", "label20" };
foreach (string labelName in labelNames)
{
Control[] matches = this.Controls.Find(labelName, true);
if (matches.Length > 0 && matches[0] is Label)
{
Label label = (Label)matches[0];
label.Visible = false;
}
}