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Error while loading WSDLReader30 object

Error while loading WSDLReader30 object

Hi,

I am using WSDLReader30 object to load the specific WSDL file. But while
loading it showing an error message

WSDLReader:XML Parser failed at linenumber 0, lineposition 0, reason is:
Access is denied.
HRESULT=0x1: Incorrect function.

I checked the web service authentication in IIS. Windows Authentication is
enabled. When I access the same WSDL file through browser it is asking for
user name and password. It showed the WSDL file after I enter those details.
How can I pass the user name and password to that web service? If anonymous
access is enabled then it is working fine.Please find the code bellow

WSDLReader30 reader = new WSDLReader30Class();
IEnumWSDLService EnumService;
IWSDLService Service;
IEnumWSDLPorts EnumPort;
IWSDLPort Port;
IEnumWSDLOperations EnumOperation;
IWSDLOperation Operation;
IEnumSoapMappers EnumMapper;
ISoapMapper Mapper;
int fetched;
int Enumfetched;
string address;

reader.Load(textBox1.Text, "");
reader.GetSoapServices(out EnumService);
EnumService.Next(1, out Service, ref fetched);
label1.Text = Service.Name;
Service.GetSoapPorts(out EnumPort);
EnumPort.Next(1, out Port, ref fetched);
Port.GetSoapOperations(out EnumOperation);
address = Port.Address;
EnumOperation.Next(1, out Operation, out fetched);
Operation.GetOperationParts(out EnumMapper);
while (fetched == 1)
{

listBox1.Items.Add(Operation.Name);
EnumOperation.Next(1, out Operation, out fetched);

}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
listBox2.Items.Clear();
listBox3.Items.Clear();
string methodname = listBox1.SelectedItem.ToString();
EnumOperation.Find(methodname, out Operation);
Operation.GetOperationParts(out EnumMapper);

EnumMapper.Next(1, out Mapper, out Enumfetched);

while (Enumfetched == 1)
{
listBox2.Items.Add(Mapper.ElementName);
listBox3.Items.Add(Mapper.ElementType);
EnumMapper.Next(1, out Mapper, out Enumfetched);
}
}

If any body came accross this same scenario?
--
Rajesh