Hi Rajus,
 Please refer below sample.
TextFile
<TA>
  <Response>
    <User_Id>CGG</User_Id>
    <Aadhar_Id>121212121212</Aadhar_Id>
    <OTP info="01{A,2021-11-30T17:50:34,2.5,d320b4ab5e07ae4b14742670399e4fc744b1522306197afd2ba3d3ada498e39d,2e5b42bbb406322a1c38d2d345c9c0ff06437ade9756db39ff29131181b3b13b,2e5b42bbb406322a1c38d2d345c9c0ff06437ade9756db39ff29131181b3b13b,NA,NA}"
         status="998" Description="Invalid Aadhaar Number." Code="30f1de0363614c6395e735a068b13cef" RRN="133417175257" txn="000113000020211130175034891133417175257" />
  </Response>
</TA>
HTML
User Id: <asp:Label ID="lblUserId" runat="server" /><br />
Aadhar Id: <asp:Label ID="lblAadhar" runat="server" /><br />
OTP: <asp:Label ID="lblOTP" runat="server" />
Namespace
C#
using System.Data;
using System.IO;
using System.Xml;
 VB.Net
Imports System.Data
Imports System.IO
Imports System.Xml
Code
C#
protected void Page_Load(object sender, EventArgs e)
{
    string xml = File.ReadAllText(Server.MapPath("~/Xml.txt"));
    XmlDocument doc = new XmlDocument();
    doc.LoadXml(xml);
    XmlNodeList nodeList = doc.SelectNodes("/TA/Response");
    lblUserId.Text = nodeList[0]["User_Id"].InnerText;
    lblAadhar.Text = nodeList[0]["Aadhar_Id"].InnerText;
    lblOTP.Text = (nodeList[0]["OTP"].Attributes)["RRN"].InnerText;
}
  VB.Net
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim xml As String = File.ReadAllText(Server.MapPath("~/Xml.txt"))
    Dim doc As XmlDocument = New XmlDocument()
    doc.LoadXml(xml)
    Dim nodeList As XmlNodeList = doc.SelectNodes("/TA/Response")
    lblUserId.Text = nodeList(0)("User_Id").InnerText
    lblAadhar.Text = nodeList(0)("Aadhar_Id").InnerText
    lblOTP.Text = (nodeList(0)("OTP").Attributes)("RRN").InnerText
End Sub
 
Screenshot
