login status that whether any user is currently login or not

for this application implementaion
first step you have to do is in login page insert the names,ids of the users who are currently logged in the site into a table with a name for eg:"tblonlineusers"

second step in defalut.aspx page or what ever the page you have implement, do
the following code for checking who are currently online.

in this page take a grid view control and fill the details about names,id who are in online.

the code is


public void fillonlineusers()
{
try
{
OleDbDataAdapter da = new OleDbDataAdapter("select * from tblOnlineusers", olecon);
DataSet ds = new DataSet();
da.Fill(ds);
gridview1.DataSource = ds.Tables[0];
gridview1.DataBind();
}
catch (Exception e1)
{
Response.Write(e1.Message);
}

}


this step makes find users currently logged in.
so in the above step count number of users
if count>0
then write the code whatever you want.
else
print a default message


hope this is helpful otherwise send reply i will send full source code of my project

thanks
vikranth reddy