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POWriting to an XML file using standard microsoft libraries
 

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  1. POWriting to an XML file using standard microsoft libraries
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    <p>I am trying to write values into an XML file using this function. I am retaining the value under sql_connection, but am receiving the error, "Object reference not set to an instance of an object." I understand what the error means, but I do not know how to work with XML files. How should I approach this problem? When I step through my code it stops at myNode.Value = sql_connection; It says I am returning a null value, but sql_connection sees the value I entered on my admin page. Thanks in advance.</p> <pre><code> public void SAVEsqlConnection(string sql_Connection) { XmlDocument myXmlDocument = new XmlDocument(); myXmlDocument.Load("C:\\Users\\fthompson11\\WebFile.xml"); XmlNode root = myXmlDocument.DocumentElement; XmlNode myNode = root.SelectSingleNode("/connectionString"); myNode.Value = sql_Connection; myXmlDocument.Save("C:\\Users\\fthompson11\\WebFile.xml"); } </code></pre> <p>I have also tried doing this:</p> <pre><code> public void SAVEsqlConnection(string sql_Connection) { XmlDocument myXmlDocument = new XmlDocument(); myXmlDocument.Load("C:\\Users\\fthompson11\\WebFile.xml"); string connectionStringXPath = "/ConnectionStrings/add[@connectionString=\"{0}\"]"; connectionStringXPath = string.Format(connectionStringXPath, sql_Connection); XmlNode node = myXmlDocument.SelectSingleNode(connectionStringXPath); node.Attributes["ConnectionStrings"].Value = sql_Connection; myXmlDocument.Save("C:\\Users\\fthompson11\\WebFile.xml"); } </code></pre> <p>Here you go:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!--This is to write the connection string--&gt; -&lt;ConnectionStrings&gt; &lt;add connectionString="asdf" Name="sqlConnection1"/&gt; &lt;/ConnectionStrings&gt; </code></pre>
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    1. USBig Poppa
    1. USBig Poppa
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      1. POWriting to an XML file using standard microsoft libraries
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      1. VTUpMod
    1. COSounds to me like `myNode` is null, not `sql_Connection`. Please show your sample xml as well, it seems like your `.SelectSingleNode` isn't returning anything.
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      1. USKirk Woll
    2. COAgreed. Too bad he didn't include what line the error occurred on. Then we wouldn't have to guess.
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      1. USSteve Wellens
    3. COYou are looking like making configuration file. you can use Configuration, configuration section e.t.c classes to make those config file
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      1. USKamran Shahid
 

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