列表视图错误c#

我有一个列表视图。我想从中选择第一个元素，然后调用一个方法。问题是，虽然我在列表视图中有该元素，但我不知道为什么当我想选择该元素时以下代码不起作用。需要帮忙。谢谢

listview.Items[0].Selected = true;
listview.Select();
int c =listview.SelectedItems.Count;
MessageBox.Show(c + ": and : " + listview.Items[0].ToString()); .//here the c=0 and it should be 1:(
//  Thread.Sleep(3000);
method();  

I have:

ListViewItem it = new ListViewItem("a");
it.SubItems.Add("s");
it.SubItems.Add(""v");
it.Tag = call;
listview.Items.Add(it);

for

System.Windows.Forms.ListViewItem listViewItem4 = new System.Windows.Forms.ListViewItem("fdasf");
System.Windows.Forms.ListViewItem listViewItem5 = new System.Windows.Forms.ListViewItem("sdfsadf");
System.Windows.Forms.ListViewItem listViewItem6 = new System.Windows.Forms.ListViewItem("gdsgdfg");

and

this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] {
    listViewItem4,
    listViewItem5,
    listViewItem6});
this.listView1.Location = new System.Drawing.Point(84, 88);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(121, 97);
this.listView1.TabIndex = 0;
this.listView1.UseCompatibleStateImageBehavior = false;
this.listView1.View = System.Windows.Forms.View.List;

这有效并且 c 是 1

listView1.Items[0].Selected = true;
listView1.Select();
int c =listView1.SelectedItems.Count;
MessageBox.Show(c + ": and : " + listView1.Items[0].ToString());
//  Thread.Sleep(3000);
method();  

问题可能出在其他地方。