For dynamic Database connection Crystal Reports

Database connection Crystal Reports doesn´t works!!!

            crConnectionInfo.ServerName = "YOUR SERVER NAME";
            crConnectionInfo.DatabaseName = "YOUR DATABASE NAME";
            crConnectionInfo.UserID = "YOUR DATABASE USERNAME";
            crConnectionInfo.Password = "YOUR DATABASE PASSWORD";

            CrTables = cryRpt.Database.Tables ;
            foreach (CrystalDecisions.CrystalReports.Engine.Table CrTable in CrTables)
            {
                crtableLogoninfo = CrTable.LogOnInfo;
                crtableLogoninfo.ConnectionInfo = crConnectionInfo;
                CrTable.ApplyLogOnInfo(crtableLogoninfo);
            }

but this Works fine!

foreach (Table crTable in objRpt.Database.Tables)
            {
                TableLogOnInfo logOnInfo = new TableLogOnInfo();
                logOnInfo = objRpt.Database.Tables[crTable.Name].LogOnInfo;
 
                // Set the connection information for the table in the report.
                logOnInfo.ConnectionInfo.ServerName = server.Trim();
                logOnInfo.ConnectionInfo.DatabaseName = database.Trim();
                logOnInfo.ConnectionInfo.UserID = username;
                logOnInfo.ConnectionInfo.Password = password;
                objRpt.Database.Tables[crTable.Name].ApplyLogOnInfo(logOnInfo);
}