Insertion Using SharePoint Default Webservices

string strInsertCommand = string.Empty;
strInsertCommand = "" + txtUserName.Text + "" + txtPassword.Text + "";
InsertSampleService.Lists objLogin = new InsertSampleService.Lists();
objLogin.UseDefaultCredentials=true;
objLogin.Url = "http://vlnrm:100/_vti_bin/Lists.asmx";
string strListName = "Test";
XmlDocument xmlDoc = new System.Xml.XmlDocument();

System.Xml.XmlElement elBatch = xmlDoc.CreateElement("Batch");

elBatch.SetAttribute("OnError", "Continue");

elBatch.SetAttribute("ListVersion", "1");

elBatch.InnerXml = strInsertCommand;

XmlNode ndReturn = objLogin.UpdateListItems(strListName, elBatch);

string result = ndReturn.OuterXml.ToString();
txtUserName.Text = "";
txtPassword.Text = "";
txtUserName.Focus();