SPQuery OR

 private void TestSearchLists()
        {
            try
            {
                SPSite site = SPControl.GetContextSite(Context);
                SPList list = site.RootWeb.Lists["Advocates Profiles"];
                SPView view = list.Views[0];
                SPListItemCollection listColl = list.GetItems(view);

                //  SPFieldCollection = list.Fields;

                SPQuery query = new SPQuery();
                query.Query = "";
                int flag = 0;
                DataTable dtSearch = new DataTable();
                for (int i = 0; i < list.Fields.Count; i++)
                {
                    // Response.Write(list.Fields[i].InternalName+ "::" + list.Fields[i].Hidden.ToString() + "::" + list.Fields[i].ReadOnlyField.ToString()+ "<BR>");
                    if ((list.Fields[i].Type.ToString() == "Text" || list.Fields[i].Type.ToString() == "Note") && !list.Fields[i].Hidden && !list.Fields[i].ReadOnlyField)
                    {
                        // Response.Write("aa  " + list.Fields[i].InternalName + "   " + list.Fields[i].Type.ToString () + "<BR>");

                        query.Query += "<Contains><FieldRef Name='" + list.Fields[i].InternalName + "'/><Value Type='Text'>ee</Value></Contains>";
                        flag++;
                        if (flag > 1)
                        {
                            query.Query = "<Or>" + query.Query + "</Or>";
                        }

                        dtSearch.Columns.Add(list.Fields[i].Title);
                    }
                }
                query.Query = "<Where>" + query.Query + "</Where>";
                this.TextBox1.Text = query.Query;
                //query.Query =
                //        "<Where>"+
                //         "<Or>" +
                //        "<Or>" +
                //        "<Or>"+
                //        "<Contains><FieldRef Name='LinkTitle'/><Value Type='Text'>cc</Value></Contains>"+
                //        "<Contains><FieldRef Name='Address_x0020_1'/><Value Type='Text'>cc</Value></Contains>"+
                //        "</Or>"+
                //        "<Contains><FieldRef Name='Address_x0020_2'/><Value Type='Text'>cc</Value></Contains>"+
                //        "</Or>" +
                //        "<Contains><FieldRef Name='City'/><Value Type='Text'>cc</Value></Contains>" +
                //         "</Or>" +
                //        "</Where>";

                SPListItemCollection listItems = list.GetItems(query);
              
         
                    for (int i = 0; i < listItems.Count; i++)
                    {
                  
                        DataRow dr = dtSearch.NewRow();

                        for (int m = 0; m < list.Fields.Count; m++)
                        {
                            if ((list.Fields[m].Type.ToString() == "Text" || list.Fields[m].Type.ToString() == "Note") && !list.Fields[m].Hidden && !list.Fields[m].ReadOnlyField)
                            {
                                if (listItems[i][list.Fields[m].InternalName] != null && listItems[i][list.Fields[m].InternalName].ToString() != string.Empty)
                                {
                                    Response.Write(listItems[i][list.Fields[m].InternalName].ToString());
                                    dr[list.Fields[m].Title] = listItems[i][list.Fields[m].InternalName].ToString();
                                }
                               
                            }
                         
                       }
                       dtSearch.Rows.Add(dr);
                    }
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }

        }