c# - Object reference not set to an instance of an object -

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i using following code check values added db table in checkboxlist, getting 'object reference not set instance of object' error here: 

listitem currentcheckbox = chkbx.items.findbyvalue(rdr["memberid"].tostring());

here's code, help!

sqldatareader rdr = null; sqlconnection conn = new sqlconnection(getconnectionstring()); sqlcommand cmd5 = new sqlcommand("select memberid projectiterationmember projectiterationid in (select projectiterationid iterations projectid = '" + proj_id + "')", conn);  try {     conn.open();     rdr = cmd5.executereader();      checkboxlist chkbx = (checkboxlist)findcontrol("project_members");     while (rdr.read())     {         listitem currentcheckbox = chkbx.items.findbyvalue(rdr["memberid"].tostring());         if (currentcheckbox != null)         {             currentcheckbox.selected = true;         }     } } {     if (rdr != null)     {         rdr.close();     }      if (conn != null)     {         conn.close();     } }

either rdr["memberid"] returns null or chkbx null control couldn't found. try rdr[0] instead case, , in second case, make sure control found.


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