How Do I Make Change Key Values In Resource File Dynamically

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C#

I Want to change the Text of label of resource file Dynamically
Using below code....
m changing the value through item index but it does not changing the correct index...
Please Help me...
Give me solution..

public string filename;

filename = "ProductCollection.aspx.resx";
filename = Request.PhysicalApplicationPath + "App_LocalResources\\" + filename;
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(filename);
XmlNodeList nlist = xmlDoc.GetElementsByTagName("data");
XmlNode childnode = nlist.Item(33);
childnode.Attributes["xml:space"].Value = "default";
xmlDoc.Save(filename);
XmlNode lastnode = childnode.SelectSingleNode("value");
lastnode.InnerText = "COLLECTIONS";
xmlDoc.Save(filename);

filename = "ProductCollection.aspx.it.resx";
filename = Request.PhysicalApplicationPath + "App_LocalResources\\" + filename;
XmlDocument xmlDoc1 = new XmlDocument();
xmlDoc1.Load(filename);
XmlNodeList nlist1 = xmlDoc1.GetElementsByTagName("data");
XmlNode childnode1 = nlist1.Item(33);
childnode1.Attributes["xml:space"].Value = "default";
xmlDoc1.Save(filename);
XmlNode lastnode1 = childnode1.SelectSingleNode("value");
lastnode1.InnerText = "COLLEZIONI";
xmlDoc1.Save(filename);