Adding node to XML at particular location based on Index

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C#

Dear friends,,
I want to add an Extra node to my XML given below...I want to add a new AttributeItem at any of the attribute row based on Index..

Please help me ,,,,what I have tried is given below in code....

<MainTable width="500px">
  <MainRow Heading="User Information">
    <AttributeRow>
      <AttributeItem AttributeType="ID" Attributelabel="Employee ID" AttributeObject="ATLEmployeeInfo" AttributeDataType="string" AttributeCMValue="" AttributeContolItem="TextBox" />
      <AttributeItem AttributeType="EmpType" Attributelabel="Employee Type" AttributeObject="ATLEmployeeInfo" AttributeDataType="string" AttributeCMValue="" AttributeContolItem="TextBox" />
    </AttributeRow>
    <AttributeRow>
      <AttributeItem AttributeType="Busi_Fax" Attributelabel="Business Fax No." AttributeObject="ATLEmployeeInfo" AttributeDataType="string" AttributeCMValue="" AttributeContolItem="TextBox" />
    </AttributeRow>
    <AttributeRow>
      <AttributeItem AttributeType="City" Attributelabel="City" AttributeObject="ATLEmployeeInfo" AttributeDataType="string" AttributeCMValue="" AttributeContolItem="DropDownList" />
    </AttributeRow>
    <AttributeRow>
      <AttributeItem AttributeType="EmpName" Attributelabel="Employee Name" AttributeObject="ATLEmployeeInfo" AttributeDataType="string" AttributeCMValue="" AttributeContolItem="TextBox" />
      <AttributeItem AttributeType="Tele_No" Attributelabel="Business Phone No." AttributeObject="ATLEmployeeInfo" AttributeDataType="string" AttributeCMValue="" AttributeContolItem="TextBox" />
    </AttributeRow>
  </MainRow>
  <MainRow Heading="StockedItemLine">
    <AttributeRow>
      <AttributeItem AttributeType="Margin" Attributelabel="Margin" AttributeObject="ATLEmployeeInfo" AttributeDataType="Double" AttributeCMValue="" AttributeContolItem="TextBox" />
      <AttributeItem AttributeType="MaterialInStock" Attributelabel="Material In Stock?" AttributeObject="ATLEmployeeInfo" AttributeDataType="Boolean" AttributeCMValue="" AttributeContolItem="TextBox" />
    </AttributeRow>
    <AttributeRow>
      <AttributeItem AttributeType="SupplierName" Attributelabel="If No Select Supplier" AttributeObject="ATLEmployeeInfo" AttributeDataType="string" AttributeCMValue="" AttributeContolItem="DropDownList" />
    </AttributeRow>
    <AttributeRow>
      <AttributeItem AttributeType="SupplierContact" Attributelabel="Supplier Contact" AttributeObject="ATLEmployeeInfo" AttributeDataType="string" AttributeCMValue="" AttributeContolItem="CommentTextBox" />
    </AttributeRow>
  </MainRow>
</MainTable>

void lnksubCell_Command(object sender, CommandEventArgs e)
        {
            string strTemp = Convert.ToString(e.CommandArgument);
            string[] strTempArray = Convert.ToString(strTemp).Split(new Char[] { ',' });

            string rowIndex = strTempArray[0].ToString();
            string tableIndex = strTempArray[1].ToString();


            XmlNodeList listMainrow = m_xmld.GetElementsByTagName("MainRow");
            XmlNode listAttRow = listMainrow[Convert.ToInt32(tableIndex)].ChildNodes[Convert.ToInt32(rowIndex)];

            XmlElement newElement = default(XmlElement);
            newElement= m_xmld.CreateElement("AttributeItem");

            XmlAttribute Attr = default(XmlAttribute);
            Attr = m_xmld.CreateAttribute("AttributeType");
            newElement.Attributes.Append(Attr);


            XmlAttribute Attr1 = default(XmlAttribute);
            Attr1 = m_xmld.CreateAttribute("Attributelabel");
            newElement.Attributes.Append(Attr1);


            XmlAttribute Attr2 = default(XmlAttribute);
            Attr2 = m_xmld.CreateAttribute("AttributeObject");
            newElement.Attributes.Append(Attr2);


            XmlAttribute Attr3 = default(XmlAttribute);
            Attr3 = m_xmld.CreateAttribute("AttributeDataType");
            newElement.Attributes.Append(Attr3);


            XmlAttribute Attr4 = default(XmlAttribute);
            Attr4 = m_xmld.CreateAttribute("AttributeCMValue");
            newElement.Attributes.Append(Attr4);


            XmlAttribute Attr5 = default(XmlAttribute);
            Attr5 = m_xmld.CreateAttribute("AttributeContolItem");
            newElement.Attributes.Append(Attr5);

            listAttRow.AppendChild(newElement);
           
            m_xmld.DocumentElement.AppendChild(listAttRow);

            string MainXML = m_xmld.OuterXml;

            //Data base connection and pass string "MainXML" to database .....
}