not getting data in list even if entering username that are in the list.

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C#

protected void btnadd_click(object sender, EventArgs e) // Event for adding username and userrole
{
int cnt = 0;
IManageUserRole imanageuserrole = new ManageUserRoleImplementation();
ManageUserRole manageuserrole = new ManageUserRole();
//manageuserrole.userName = txtUserName.Text;
//CommonService abc = new CommonService();
//List<activedirectoryuser> list = new List<activedirectoryuser>();
//list = abc.GetAllADFilterByName(txtUserName.Text);
ActiveDirectoryUtility abc = new ActiveDirectoryUtility();
List<activedirectoryuser> list = new List<activedirectoryuser>();

list = abc.GetUserName(txtUserName.Text);

var ss = from dd in list
where dd.emailId == txtUserName.Text
select dd.emailId;

foreach (var s in list)
{
if (s.userId == txtUserName.Text)
{
cnt++;
}
}
if (cnt == 0)
{
Message.ShowInfoMessage("Invalid UserName");
}


manageuserrole.userRole = ddlselectrole.Text;
manageuserrole.isActive = "TRUE";
manageuserrole.createdDate = DateTime.Now;
manageuserrole.createdByUser = Utility.GetCurrentUserEmail();
manageuserrole.lastUpdatedDate = DateTime.Now;

try
{
string status = imanageuserrole.InsertManageUserRole(manageuserrole);
Message.ShowInfoMessage(status);
//ClientScript.RegisterClientScriptBlock(GetType(), "Javascript", "<script>alert(' "+status+" ')</script>");
BindManageUserRoleGrid();
}
catch
{
Message.ShowInfoMessage("Records Not Added");
//ClientScript.RegisterClientScriptBlock(GetType(), "Javascript", "<script>alert('Records not Added')</script>");



}
}
this is my code