how read data from sharepoint list in asp.net site

Step 1:-Add a web reference of the list that you want to access the lists are exposed through services that reside in _vt_bin folder.

step 2:-Create object of Webreference_name.Lists obj=new Webreference_name.Lists()
obj.Credentials = System.Net.CredentialCache.DefaultCredentials;

step 3:- string listName = "list_name";
string viewName = "";
string rowLimit = "150";
XmlElement query = xmlDoc.CreateElement("Query");
XmlElement viewFields = xmlDoc.CreateElement("ViewFields");
XmlElement queryOptions = xmlDoc.CreateElement("QueryOptions");

step 4:-

query.InnerXml = "<Where><Gt><FieldRef Name=\"ID\" />" +
                    "<Value Type=\"Counter\">1</Value></Gt></Where>";

StringBuilder fieldRef = new StringBuilder();
fieldRef.Append("<FieldRef Name=\"Field_Name\" />");

viewFields.InnerXml = fieldRef.ToString();



               queryOptions.InnerXml = "<IncludeMandatoryColumns>FALSE</IncludeMandatoryColumns>";


               System.Xml.XmlNode nodeListItems =
                   objListService.GetListItems
                   (listName, viewName, query, viewFields, rowLimit, queryOptions, null);

XmlDataDocument xmlDocResult = new XmlDataDocument();
xmlDocResult.LoadXml(nodeListItems.InnerXml);
XmlNodeList rows = xmlDocResult.GetElementsByTagName("z:row"); //fetching data from xmlnodelist on row basis
foreach(XmlNode attr in rows)
{
//logic
}