Access Control ID on ContentPage from MasterPage in ASP.Net

I want to set  XML value into ContentPage Control from masterPage.

Textbox/ddl/checkbox etc.

<form><Childs><HiddenField><ID>hdnSessionUserpracticeId</ID><Value>7c180b88-57d6-4c38-b47b-d95388742bf4</Value></HiddenField><Label><ID>lblOnlineUser</ID><Text> <b>Live Users: </b>1</Text></Label><DropDownList><ID>cbo_Practice</ID><SelectedValue>7c180b88-57d6-4c38-b47b-d95388742bf4</SelectedValue></DropDownList></Childs></form>

public void BindValuesAfterLogin(Guid UserPracticeId, System.Web.UI.ControlCollection controls)
{
    DataSet ds = new DataSet();
    using (var en = new DentalComplianceEntities())
    {
        var logoutData = en.LogoutTables.Where(q => q.UserPracticeId == UserPracticeId).FirstOrDefault();
        if (logoutData != null)
        {
            FinalXML = logoutData.FormData;
            XDocument doc = XDocument.Parse(FinalXML);
            XmlReader reader = doc.CreateReader();
            ds.ReadXml(reader);
            BindFormControls(ds, controls);
            //DataSet dataTable = XMLtoDataTable(logoutData.FormData);
            //en.LogoutTables.Remove(logoutData);
            //en.SaveChanges();
        }
    }
}
 
private void BindFormControls(DataSet ds, System.Web.UI.ControlCollection controls)
{
    foreach (DataTable dt in ds.Tables)
    {
        var name = dt.TableName;
 
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            foreach (Control c in controls)
            {
                switch (name)
                {
                    case "HiddenField":
                        if (c is HiddenField && ((HiddenField)c).ID == Convert.ToString(dt.Rows[i]["ID"]))
                        {
                            ((HiddenField)c).Value = Convert.ToString(dt.Rows[i]["Value"]);
                        }
                        break;
                    case "TextBox":                               
                        var ass = c.Page.FindControl(dt.Rows[i]["ID"].ToString());
                        if (c is TextBox && ((TextBox)c).Page.ID == Convert.ToString(dt.Rows[i]["ID"]))
                        //if (ass.Controls. == Convert.ToString(dt.Rows[i]["ID"]))
                        {
                            ((TextBox)c).Text = Convert.ToString(dt.Rows[i]["Text"]);
                        }
                        break;
                    case "Label":
                        if (c is Label && ((Label)c).ID == Convert.ToString(dt.Rows[i]["ID"]))
                        {
                            ((Label)c).Text = Convert.ToString(dt.Rows[i]["Text"]);
                        }
                        break;
                    case "CheckBox":
                        if (c is CheckBox && ((CheckBox)c).ID == Convert.ToString(dt.Rows[i]["ID"]))
                        {
                            ((CheckBox)c).Checked = Convert.ToBoolean(dt.Rows[i]["Checked"]);
                        }
                        break;
                    case "CheckBoxList":
                        if (c is CheckBoxList && ((CheckBoxList)c).ID == Convert.ToString(dt.Rows[i]["ID"]))
                        {
                            ((CheckBoxList)c).SelectedValue = Convert.ToString(dt.Rows[i]["SelectedValue"]);
                        }
                        break;
                    case "RadDateInput":
                        if (c is RadDateInput && ((RadDateInput)c).ID == Convert.ToString(dt.Rows[i]["ID"]))
                        {
                            ((RadDateInput)c).SelectedDate = string.IsNullOrEmpty(Convert.ToString(dt.Rows[i]["SelectedDate"])) ? ((RadDateInput)c).SelectedDate : Convert.ToDateTime(dt.Rows[i]["SelectedDate"]);
                        }
                        break;
                    case "RadEditor":
                        if (c is RadEditor && ((RadEditor)c).ID == Convert.ToString(dt.Rows[i]["ID"]))
                        {
                            ((RadEditor)c).Content = Convert.ToString(dt.Rows[i]["Content"]);
                        }
                        break;
                    case "RadScheduler":
                        if (c is RadScheduler && ((RadScheduler)c).ID == Convert.ToString(dt.Rows[i]["ID"]))
                        {
                            ((RadScheduler)c).SelectedDate = string.IsNullOrEmpty(Convert.ToString(dt.Rows[i]["SelectedDate"])) ? ((RadScheduler)c).SelectedDate : Convert.ToDateTime(dt.Rows[i]["SelectedDate"]);
                        }
                        break;
                }
            }
        }
    }
}