CAML Query not working

Hi All,

         -> I had written a simple query to get listitem based on List ID and show list info in textboxes,Below is the code

         ->Can any one help me for what reason I am unable to fetech data and show in textboxes from below code

SPSite mysite = SPContext.Current.Site;
SPWeb myweb = mysite.OpenWeb();
SPList mylist = myweb.Lists["Manger"];
SPItem myitem = mylist.Items.Add();
SPQuery myquery = new SPQuery();
string idvalue = txtid.Text.ToString();
                      myquery.Query=

@"<Where><Eq><FieldRef Name='ID'/><Value Type='Number'>"+txtmanagerid.text.tostring()+"</Value> </Eq></Where>";
SPListItemCollection queryitems = mylist.GetItems(myquery);
foreach (SPListItem myitems in queryitems)

                      {

                         txtlocation.Text = myitems["Month"].ToString();

                      }

Samar