如何在页面刷新后保持CheckBox检查状态？

Question

我正在使用listview并尝试删除已检查的多个数据。但是当按下“删除”按钮时，页面将刷新，并且不会检查复选框，以便不会删除数据。这是我的代码： 页面加载：

protected void Page_Load(object sender, EventArgs e)
{
    if (Session["username"] == null)
        Response.Redirect("admin-login");
    lblusername.Text = Session["username"].ToString();
    string nation;

         bindListview();

 }

删除按钮代码：

protected void btnDelete_Click(object sender, EventArgs e)
{
    try
    {

        foreach (ListViewDataItem Ldi in ListView1.Items)
        {
            CheckBox cb = (CheckBox)(Ldi.FindControl("chkBxSelect"));
            HiddenField hdnFldCandidateID = (HiddenField)(Ldi.FindControl("hdnFldCandidateID"));
            string candidateID = hdnFldCandidateID.Value;

            if (cb.Checked)
            {
                ScriptManager.RegisterStartupScript(this, this.GetType(), "Confirm", "Confirm();", true);
                con.Open();
                query = "delete from candidates where candidate_id=" + candidateID + "";
                cmd = new SqlCommand(query, con);
                cmd.ExecuteNonQuery();
                con.Close();
                Response.Redirect("candidate-search");

            }

        }
    }
    catch (Exception ex)
    {
        Response.Write("Error:" + ex);
    }
    finally
    {
        con.Close();
    }
}