string to xml asp.net

Below codes, myDatas will return xml string, and I want xml string to be saved as xml document in c:\\server\\folder\

How can I do that?


 [WebMethod]
        public string HelloWorld2()
        {
            string errorMessage = "";
            string myDatas = "";
            //Connection string is stored
            //in the web.config file as an appSetting
            string connectionString = "Data Source=LAX-MJHEHHK;Initial Catalog=Surety;Integrated Security=True";
            SqlConnection dbConnection = null;
            // Open a connection to the database
            try
            {
                dbConnection = new SqlConnection(connectionString);
                dbConnection.Open();
            }
            catch (Exception ex)
            {
                errorMessage = ex.Message;
            }
            if (errorMessage == "")
            {
                // Build an insert command
                string SQL = "SELECT PrincipalID,PrincipalName FROM Principals FOR XML AUTO, ELEMENTS";
                SqlCommand GetCustomerCmd = new SqlCommand(SQL, dbConnection);
                try
                {
                    XDocument results = new XDocument(new XElement("results"));
                    using (XmlReader reader = GetCustomerCmd.ExecuteXmlReader())
                    {
                        reader.Read();
                        while (!reader.EOF)
                        {
                            myDatas = myDatas + reader.ReadOuterXml();
                        }                        
                    }
                    dbConnection.Close();
                }
                catch (System.Exception ex)
                {
                    errorMessage = ex.Message;
                }
                finally
                {
                    dbConnection.Dispose();
                }
            }
            return myDatas;
        }
LVL 1
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Miguel OzSoftware EngineerCommented:
Could you post a sample of your xml string?
The solution could use LoadXml method as follows:
XmlDocument doc= new XmlDocument();
doc.LoadXml("myXmlString");
doc.PreserveWhitespace = true
doc.Save("Your file full path")

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0
ITsolutionWizardAuthor Commented:
my file name is C:\Program Files, and it does not work ....

doc.Save("C:\Program Files")
0
Miguel OzSoftware EngineerCommented:
It has to be a valid windows xml filename:
c:\\server\\folder\myxmlname.xml
You cannot store it to a folder. By the it is not a good idea to save under folder "C:\Program Files" it should only contain folders of the programs you installed in the PC.
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ITsolutionWizardAuthor Commented:
not working.

it complaints "There are multiple root elements."


here is result from xml

<?xml version="1.0" encoding="UTF-8"?>
<string xmlns="http://tempuri.org/">

<Principals>
<PrincipalID>1</PrincipalID>
<PrincipalName>Sam</PrincipalName>
</Principals>

<Principals>
<PrincipalID>2</PrincipalID>
<PrincipalName>Mary</PrincipalName>
</Principals>

</string>
0
Miguel OzSoftware EngineerCommented:
Q1. Could you post the contents of "myDatas" after being read from database? (breakpoint at dbConnection.Close();)
Q2. Where in your code you are consuming the xml string? My solution assumes that you are planning to save myDatas before sending that info to your client program.

"Multiple root..." error means there is no one root node in your xml string. The typical solution is to create a unique parent node as shown in Rob's answer
For example if you are capturing the response in the client:
1) Remove the following constructs
<?xml version="1.0" encoding="UTF-8"?>
 <string xmlns="http://tempuri.org/">
</string>
2) Create a unique parent node (<PrincipalRoot>) so that your new string will look like
<PrincipalRoot>
<Principals>
 <PrincipalID>1</PrincipalID>
 <PrincipalName>Sam</PrincipalName>
 </Principals>

 <Principals>
 <PrincipalID>2</PrincipalID>
 <PrincipalName>Mary</PrincipalName>
 </Principals>
</PrincipalRoot>
3) Now save this string using my previous posted code.
0

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