Dataset not updating

Hi All,
I am using following code to Read/Write XML in ASP.NET. But the resultant XML is not reflecting the changes.

VB Code:

System.Data.DataSet merchantDS = new System.Data.DataSet();
        
merchantDS.ReadXml(MapPath(".") + "\\Merchant.xml");
 
merchantDS.Tables["General"].Rows[1].ItemArray.SetValue("Anjani", 0);
 
if (merchantDS.HasChanges())
{
      merchantDS.AcceptChanges();
}
      
merchantDS.AcceptChanges();
 
merchantDS.WriteXml(MapPath(".") + "\\" + txtMerchantName.Text + ".xml");

Please find the attached XML file.
Please help!!!