Cannot serialize the DataTable. DataTable name is not set.

Step1:- Create BindData() method

protected void BindData()

        {

            DataTable dt = new DataTable();

            DataRow dr;

            dt.Columns.Add(new DataColumn("Column1", typeof(string)));

            dt.Columns.Add(new DataColumn("Column2", typeof(string)));

            dt.Columns.Add(new DataColumn("Column3", typeof(string)));

            dt.Columns.Add(new DataColumn("Column4", typeof(string)));

            int totalRow = 10;

            for (int i = 0; i < totalRow; i++)

            {

                dr = dt.NewRow();

                dr["Column1"] = "Row" + i;

                dr["Column2"] = "Row" + i;

                dr["Column3"] = "Row" + i;

                dr["Column4"] = 1000 / (i + 1);

                dt.Rows.Add(dr);

            }

            string strXML = ConvertDataTableToXML(dt);

        }

Step 2:- Create ConvertDataTableToXML() method

public string ConvertDataTableToXML(DataTable dt)

        {

            MemoryStream ms = new MemoryStream();

            dt.WriteXml(ms, true);

            ms.Seek(0, SeekOrigin.Begin);

            StreamReader sr = new StreamReader(ms);

            string xml = sr.ReadToEnd();

            sr.Close();

            return (xml);

        }

Step3:- Complete Code

using System;

using System.Collections.Generic;

using System.Data;

using System.IO;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Demo

{

    public partial class Default : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            if (!Page.IsPostBack)

            {

                BindData();

            }

        }

        protected void BindData()

        {

            DataTable dt = new DataTable();

            DataRow dr;

            dt.Columns.Add(new DataColumn("Column1", typeof(string)));

            dt.Columns.Add(new DataColumn("Column2", typeof(string)));

            dt.Columns.Add(new DataColumn("Column3", typeof(string)));

            dt.Columns.Add(new DataColumn("Column4", typeof(string)));

            int totalRow = 10;

            for (int i = 0; i < totalRow; i++)

            {

                dr = dt.NewRow();

                dr["Column1"] = "Row" + i;

                dr["Column2"] = "Row" + i;

                dr["Column3"] = "Row" + i;

                dr["Column4"] = 1000 / (i + 1);

                dt.Rows.Add(dr);

            }

            string strXML = ConvertDataTableToXML(dt);

        }

        public string ConvertDataTableToXML(DataTable dt)

        {

            MemoryStream ms = new MemoryStream();

            dt.WriteXml(ms, true);

            ms.Seek(0, SeekOrigin.Begin);

            StreamReader sr = new StreamReader(ms);

            string xml = sr.ReadToEnd();

            sr.Close();

            return (xml);

        }

    }

}

Step4:- Put debugger on ConvertDataTableToXML method and Run the code

When you run the code, you will get the following error:-

Error states that while creating the DataTable object, you are not given the DataTable name.

See heighted code.

So, you need to assign a table name to DataTable.

Before

DataTable dt = new DataTable();

After

DataTable dt = new DataTable("Table1");

or 

DataTable dt = new DataTable();

dt.TableName = "Table1";