OracleCommand.Executenonquery throws 'System.InvalidOperationException'

The following function throws the System.InvalidOperationException:

internal void executeNonQuery(string connectionString, OracleCommand cmd)
    {
        using (OracleConnection conn = new OracleConnection(connectionString))
        {
            using (cmd)
            {
                conn.Open();
                cmd.ExecuteNonQuery(); //here is the error
                conn.Close();
            }
        }
    }

The additional information is:

Operation is not valid due to the current state of the object.

I try to insert a row into a table. Is there another way to do this or to fix this error?

EDIT: I build the query in the binaryManager class with the following methods:

internal object[] binaryInsert(string tblName, string tblQuery, int conStrgID, int cq)
    {
        object[] retValues = new object[3];
        Stream myStream = null ;
        OracleConnection con = null;
        string conString = qm.getConnectionString("ConnectionStringToMyDB"); //is correct

        byte[] data = GetBytes(tblQuery);

        String sql = "INSERT INTO MYTABLES VALUES (NULL, '" + tblName + "', ':tblQueryBlob', " + conStrgID + ", " + cq + ")";


        OracleCommand cmd = new OracleCommand();
        cmd.CommandText = sql;  // Set the sql-command
        cmd.Connection = con;   //con is an OracleConnection

        OracleParameter param = cmd.Parameters.Add("tblQueryBlob", OracleDbType.Blob); //Add the parameter for the blobcolumn
        param.Direction = ParameterDirection.Input;

        param.Value = data;     //Asign the Byte Array to the parameter

        //command containts the parameter :tblQueryBlob with its value
        retValues[0] = cmd;
        retValues[1] = conString;

        return retValues;
    }

private byte[] GetBytes(string str)
    {
        byte[] bytes = new byte[str.Length * sizeof(char)];
        System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
        return bytes;
    }

I call the binaryInsert method from another class with the following code:

BinaryManager bm = new bBinaryManager();
string sqlQuery = "large string with 5100 characters";
object[] binaryValues = bm.binaryInsert("TextTbl", sqlQuery, 1, 1);
string conString = binaryValues[1].ToString();
OracleCommand cmd = (OracleCommand)binaryValues[0];

QueryManager qm = new QueryManager();
qm.executeNonQuery(conString, cmd);

via Chebli Mohamed