code follows

string connectionString =
WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
SqlConnection con = new SqlConnection(connectionString);
string sql = "SELECT * FROM Employees";
SqlCommand cmd = new SqlCommand(sql, con);
// Open the Connection and get the DataReader.
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
// Cycle through the records, and build the HTML string.
StringBuilder htmlStr = new StringBuilder("");
while (reader.Read())
{
htmlStr.Append("<li>");
htmlStr.Append(reader["TitleOfCourtesy"]);
htmlStr.Append(" <b>");
htmlStr.Append(reader.GetString(1));
htmlStr.Append("</b>, ");
htmlStr.Append(reader.GetString(2));
htmlStr.Append(" - employee from ");
htmlStr.Append(reader.GetDateTime(6).ToString("d") );
htmlStr.Append("</li>");
}
// Close the DataReader and the Connection.
reader.Close();
con.Close();
// Show the generated HTML code on the page.
HtmlContent.Text = htmlStr.ToString();

.................................................. ...

what is HtmlContent here??
if i want to replace it.....what can i use???

Your code snippet basically build up a list for your html page using the string builder function.

If you want to change the content, then you would have to replace what is inside the while (reader.Read()) loop.

Hope this is your question .