Adding and updating column to an Existing XML file in C#

// creating dataset

DataSet ds = new DataSet();

       

// Reading XML file through ReadXml method which reads XML file and converts into Data Tables

ds.ReadXml("XMLFilePath");

// adding Required Column to an existing Table in dataset, here I am assuming my table is in '0' position in Dataset.

 ds.Tables[0].Columns.Add("ColumnName", typeof(string));

 // Here assigning value to Added Column

 for (int i = 0; i < ds.Tables[0].Rows.Count; i++)

  {

   ds.Tables[0].Rows[i]["ColumnName"] = "Test";

  }

// writing dataset to xml file, xml file will be update with new column (Recently Added)

ds.WriteXml("XMLFilePath");

Microsoft Visual C# 2010 Step by Step