how to change the webconfig file through programatically

Koteswararao Mallisetti

16y18.6k.NET

hi

how to we change the web.config settings through programatically i am able to access the settings but unable to write while i save it shows access is denied error in the save

the code is

static Configuration myConfig=WebConfigurationManager.OpenWebConfiguration("~/");
    static KeyValueConfigurationElement myElement = null;

   myelement.value="some xyx";
     myConfig.Save(); -->here it show error
        myConfig.Save(ConfigurationSaveMode.Modified);

4 Replies

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Manikavelu Velayutham16y ago
Here is a complete code that will do all the manipulations like edit delete create encrypt and all the stuffs.

http://www.dotnetspider.com/resources/17562-Edit-Delete-Create-Encrypt-sections.aspx

Enjoy :)
Manikavelu Velayutham16y ago
Here is the way that you need.

http://stackoverflow.com/questions/1300423/how-to-edit-an-external-web-config-file

// the key of the setting
string key = "MyKey";

// the new value you want to change the setting to
string value = "This is my New Value!";

// the path to the web.config
string path = @"C:\web.config";

// open your web.config, so far this is the ONLY way i've found to do this without it wanting a virtual directory
// even "OpenExeConfiguration" will not work
var config = ConfigurationManager.OpenMappedExeConfiguration(new ExeConfigurationFileMap() { ExeConfigFilename = path }, ConfigurationUserLevel.None);

// now that we have our config, grab the element out of the settings
var element = config.AppSettings.Settings[key];

// it may be null if its not there already
if (element == null)
{
// we'll handle it not being there by adding it with the new value
config.AppSettings.Settings.Add(key, value);
}
else
{
// note: if you wanted to you could inspect the current value via element.Value

// in this case, its already present, just update the value
element.Value = value;
}

// save the config, minimal is key here if you dont want huge web.config bloat
config.Save(ConfigurationSaveMode.Minimal, true);
Before:
xml version="1.0"?> key="MyKey" value="OldValue" /> name="myConnString" connectionString="blah blah blah" providerName="System.Data.SqlClient" />

After:
xml version="1.0"?> key="MyKey" value="This is my New Value!" /> name="myConnString" connectionString="blah blah blah" providerName="System.Data.SqlClient" /> level="Full" /> clientScriptsLocation="/aspnet_client/{0}/{1}/" />
Koteswararao Mallisetti16y ago
this is just xml file editing i want not in this way only in system.configuration classes model
Manikavelu Velayutham16y ago
Complete project is uploaded with this post. You can modify the web.config programatically.
Sample code is also as below.
private void Form1_Load(object sender, EventArgs e)
{
XElement xml = XElement.Load(@"D:\My Tools\ModifyConfig\ModifyConfig\web.config");
var connstrxml = xml.Descendants("connectionStrings").Elements().First();
string connStr = connstrxml.Attribute("connectionString").Value;
//MessageBox.Show(connStr);
string newConnString = string.Empty;
string attribute = string.Empty;
string value = string.Empty;
string[] a = connStr.Split(';');
for (int i = 0; i < a.Length - 1; i++)
{
string[] b = a[i].Split('=');
if (b.Length == 2)
{
attribute = b[0]; value = b[1];
if (attribute.Equals("Initial Catalog", StringComparison.OrdinalIgnoreCase))
{
value = "Manik DB";
}
}
newConnString = newConnString + attribute + "=" + value + ";";
}
connstrxml.SetAttributeValue("connectionString", newConnString);
xml.Save(@"D:\My Tools\ModifyConfig\ModifyConfig\web.config");
}