error on inserting data into mysql

OdbcConnection myConn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver};Server=localhost;Database=test;User=test;Password=test;Option=3;");
              string queryStr = "Insert into tblstudentDetails ( rollNo,formNo,citycode,firstName,lastName,fatherName,Gender,"

                +"dob,centerCode,examDate,faceImageLocation,keydata ) values(  ?,?,?,?,?,?,?,?,?,?,?,?);";             OdbcCommand cmd = new OdbcCommand(queryStr,myconnNew);
            myconnNew.Open();
                       cmd.Parameters.Add(new OdbcParameter("rollNo", "533003"));
            cmd.Parameters.Add(new OdbcParameter("formNo", "1"));
            cmd.Parameters.Add(new OdbcParameter("citycode", "9"));
            cmd.Parameters.Add(new OdbcParameter("firstName", "SHREYA CHITNAVIS"));
            cmd.Parameters.Add(new OdbcParameter("lastName", "SHREYA CHITNAVIS"));
            cmd.Parameters.Add(new OdbcParameter("fatherName", "ABHAY CHITNAVIS"));
            cmd.Parameters.Add(new OdbcParameter("Gender", "m"));
            cmd.Parameters.Add(new OdbcParameter("dob", "1995-05-12"));
            cmd.Parameters.Add(new OdbcParameter("centerCode", "9003"));
            cmd.Parameters.Add(new OdbcParameter("examDate", "2003-01-04"));
            cmd.Parameters.Add(new OdbcParameter("faceImageLocation", "c:\\VAYAPAMIMAGE\\07-07-2013\\9\\p1.jpg"));
            cmd.Parameters.Add(new OdbcParameter("keydata", "E5CAFC3CCF056BE4A319A1FD0FF8BE08"));                       
            cmd.ExecuteNonQuery();
            myConn.Close();
----------------------------

It's working pretty fine. Schema is also as you've mentioned, check it below:
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CREATE TABLE `tblstudentdetails` (
  `rollno` bigint(20) default NULL,
  `formNo` bigint(20) default NULL,
  `citycode` bigint(20) default NULL,
  `firstname` varchar(100) default NULL,
  `lastname` varchar(100) default NULL,
  `fathername` varchar(100) default NULL,
  `gender` char(1) default NULL,
  `dob` datetime default NULL,
  `centercode` bigint(20) default NULL,
  `examdate` datetime default NULL,
  `faceimagelocation` varchar(256) default NULL,
  `keydata` varchar(256) default NULL
)
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So what I would sugest you at this point is to check if it's getting a value for "keydata" field.

Hope it helps.