I am facing a problem in my web application in the log in Page in ASP.net.The Problem is arising whenever i am authenticating my log in credentials using the LDAP to connect to Active directory in the server.I am giving you the code where the exception is getting thrown.
public string[] GetIssuerFromActiveDirectory(string loginName)
{
try
{
string[] issuerDetails = new string[3];
string path = ConfigurationManager.AppSettings["LDAPPath"];
string groupName = null;
String dn;
...
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